Abstract:
A photographic lens includes, in a sequence from an object to an image plane, a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power, where the photographic lens satisfies the following condition:
 
75°&lt;FOV&lt;85°
       where FOV is a field of view of the photographic lens.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Korean Patent Application No. 10-2015-0028196, filed on Feb. 27, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. 
     BACKGROUND 
     1. Field 
     One or more exemplary embodiments relate to photographic lenses, and more particularly, to a compact photographic lens having a high optical performance that is designed to be suitable for mobile phone cameras. 
     2. Description of the Related Art 
     Recently, the use of cameras including solid-state imaging devices such as charge coupled devices (CCDs) or complementary metal oxide semiconductor (CMOS) image sensors has been rapidly increasing. 
     The pixel integration density of solid-state imaging devices has increased to improve the resolution of cameras. Along with this, small and lightweight cameras have been developed by improving the performance of photographic lenses included in the cameras. Photographing apparatuses using solid-state imaging devices are suitable for miniaturization, and thus have recently been applied to mobile apparatuses such as smartphones. 
     In general, many lenses are used to secure an optical performance. However, the use of many lenses adversely affects miniaturization, weight lightening, and price competitiveness of cameras. When a small number of lenses are used, miniaturization and price competitiveness of cameras improve, but aberration correction may not be enough. 
     Moreover, as the professionalism of consumers for cameras has recently continuously increased, a design that accomplishes an optical performance suitable for purposes together with miniaturization has been requested. Thus, there is a demand for photographic lenses designed to accomplish miniaturization, weight lightening, and cost reduction while obtaining a desired performance. 
     SUMMARY 
     One or more exemplary embodiments include a photographic lens that is favorable for miniaturization/weight lightening and has good performance. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. 
     According to an aspect of the present invention, a photographic lens includes, in a sequence from an object to an image plane, a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power, where the photographic lens satisfies the following condition:
 
75°&lt;FOV&lt;85°
 
     where FOV is a field of view of the photographic lens. 
     The photographic lens may further satisfy the following condition:
 
1.0&lt; TTL /imgH&lt;2.0
 
     where TTL is a distance on an optical axis from an entrance surface of the first lens to the image plane, and imgH is an image height. 
     The photographic lens may further satisfy the following condition:
 
0.2&lt;BFL/ f&lt; 0.5
 
     where BFL is a distance on an optical axis from an exit surface of the fifth lens to the image plane, and f is a focal length of the photographic lens. 
     The photographic lens may satisfy the following condition:
 
1.6&lt;(Ind2+Ind3)/2&lt;1.7
 
     where Ind2 is a refractive index of the second lens and Ind3 is a refractive index of the third lens. 
     An entrance surface of the first lens may be convex toward the object. 
     An exit surface of the second lens may be concave toward the image plane. 
     The third lens may have a meniscus shape. 
     An exit surface of the fourth lens may be convex toward the image plane. 
     An exit surface of the fifth lens may be an aspherical surface having at least one inflection point. 
     All of the first lens through the fifth lens may be aspherical plastic lenses. 
     According to an aspect of the present invention, a photographic lens includes, in a sequence from an object to an image plane, a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power, wherein the photographic lens satisfies the following condition:
 
70°&lt;FOV&lt;90°
 
0.2&lt;BFL/ f&lt; 0.5
 
     where FOV is a field of view of the photographic lens, BFL is a distance on an optical axis from an exit surface of the fifth lens to the image plane, and f is a focal length of the photographic lens. 
     The photographic lens may satisfy the following condition:
 
1.6&lt;Ind2&lt;1.7
 
1.6&lt;Ind3&lt;1.7
 
     where Ind2 is a refractive index of the second lens and Ind3 is a refractive index of the third lens. 
     According to an aspect of the present invention, a photographic apparatus includes the above-described photographic lens; and an image sensor configured to convert an optical image formed by the photographic lens into an electrical signal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a cross-sectional view illustrating an optical arrangement of a photographic lens according to an embodiment; 
         FIG. 2  illustrates a longitudinal spherical aberration, astigmatic field curves, and distortion of the photographic lens according to the embodiment of  FIG. 1 ; 
         FIG. 3  is a cross-sectional view illustrating an optical arrangement of a photographic lens according to another embodiment; 
         FIG. 4  illustrates a longitudinal spherical aberration, astigmatic field curves, and distortion of the photographic lens according to the embodiment of  FIG. 3 ; 
         FIG. 5  is a cross-sectional view illustrating an optical arrangement of a photographic lens according to another embodiment; and 
         FIG. 6  illustrates a longitudinal spherical aberration, astigmatic field curves, and distortion of the photographic lens according to the embodiment of  FIG. 5 . 
     
    
    
     DETAILED DESCRIPTION 
     Exemplary embodiments of the present invention will now be described more fully with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements, and sizes of components in the drawings may be exaggerated for clarity and convenience of explanation. 
       FIG. 1  illustrates an optical arrangement of a photographic lens  1000  according to Embodiment 1. 
     Referring to  FIG. 1 , the photographic lens  1000  includes a first lens  101  having positive refractive power, a second lens  201  having negative refractive power, a third lens  301  having positive refractive power, a fourth lens  401  having positive refractive power, and a fifth lens  501  having negative refractive power, which are sequentially arranged in a direction from an object OBJ to an image plane IMG. 
     An image sensor (not shown), such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), is disposed on the image plane IMG. 
     The lenses that constitute the photographic lens  1000  achieve miniaturization, weight lightening, and a wide angle, and are shaped such that they may achieve smooth aberration correction. Hereinafter, an object side surface of each lens is referred to as an entrance surface, and an image side surface thereof is referred to as an exit surface. 
     The photographic lens  1000  may satisfy the following conditions:
 
70°&lt;FOV&lt;90°  (1)
 
     where FOV is a field of view of the photographic lens  1000 . 
     According to Condition (1), a wide angle of view is accomplished. 
     Condition (1) may be modified into Condition (1-1), and Condition (1-1) may be used.
 
75°&lt;FOV&lt;85°  (1-1)
 
     The photographic lens  1000  may satisfy the following conditions:
 
1.0 &lt;TTL /imgH&lt;2.0   (2)
 
     where FOV is a field of view of the photographic lens  1000 , TTL is an overall length of the photographic lens  1000 , namely, a distance on an optical axis from an entrance surface of the first lens  101  to the image plane IMG, and imgH is an image height. The image height is a length from a center of the image plane IMG in a diagonal direction, namely, a half of a diagonal length of an effective pixel region of an image sensor. 
     Condition (2) defines a ratio of the overall length to the effective pixel region. According to Condition (2), a compact optical system having a short overall length is accomplished. When the ratio deviates from a lower limit of Condition (2), the overall length decreases, but aberration correction is difficult. When the ratio deviates from an upper limit of Condition (2), aberration correction is easy, but the overall length increases. This impedes miniaturization of optical systems. 
     Condition (2) may be modified into Condition (2-1), and Condition (2-1) may be used.
 
1.3 &lt;TTL /imgH&lt;1.5   (2-1)
 
     The photographic lens  1000  may satisfy the following conditions:
 
0.2&lt;BFL/ f&lt; 0.5   (3)
 
     where BFL is a back focal length, namely, a distance on the optical axis from an exit surface of the fifth lens  501  to the image plane IMG, and f is a focal length of the photographic lens  1000 . 
     Condition (3) defines a ratio of the back focal length to the focal length. When the ratio satisfies Condition (3), optical systems having an optical performance may be easily manufactured. When the ratio deviates from a lower limit of Condition (3), the back focal length is small and is thus favorable to secure an optical performance, but it is difficult to perform an assembly process. When the ratio deviates from an upper limit of Condition (3), an assembly process is easily performed, but securing an optical performance is difficult. 
     Condition (3) may be modified into Condition (3-1), and Condition (3-1) may be used.
 
0.3&lt;BFL/ f&lt; 0.4   (3-1)
 
     The photographic lens  1000  may satisfy the following conditions:
 
1.6&lt;(Ind2+Ind3)/2&lt;1.7   (4)
 
     where Ind2 is a refractive index of the second lens  201  and Ind3 is a refractive index of the third lens  301 . 
     Condition (4) defines the refractive indices of the second and third lenses  201  and  301 , and each of the refractive indices has a numeric range that facilitates forming of each of the second and third lenses  201  and  301  using a low-priced plastic material. 
     Condition (4) may be modified into Conditions (4-1) and (4-2), and Conditions (4-1) and (4-2) may be used.
 
1.6&lt;Ind2&lt;1.7   (4-1)
 
1.6&lt;Ind3&lt;1.7   (4-2)
 
     In other words, each of the refractive indices of the second and third lenses  201  and  301  may satisfy Condition (4). In general, a glass material has a larger refractive index than a plastic material, but is heavier and more costly than the plastic material. A lens shaping condition of the glass material is stricter than that of the plastic material. By obtaining desired refractive power by using a material that satisfies Condition (4), weight lightening, manufacture easiness, and cost reduction may be achieved. 
     A detailed shape of each lens included in the photographic lens  1000  will now be described in detail. 
     The first lens  101  has positive refractive power, and may have a shape in which an entrance surface is convex toward the object OBJ. 
     The second lens  201  has negative refractive power, and may have a shape in which an exit surface is concave toward the image plane IMG. 
     The third lens  301  has positive refractive power, and may have a meniscus shape, for example, a meniscus shape that is convex toward the image plane IMG. 
     The first lens  401  has positive refractive power, and may have a shape in which an exit surface is convex toward the image plane IMG. The fourth lens  401  may have, for example, a meniscus shape that is convex toward the image plane IMG. 
     The fifth lens  501  has negative refractive power, and may have an aspherical shape in which an exit surface has at least one inflection point. 
     A stop ST may be disposed on the side of an entrance surface of the first lens  101 , but the location of the stop ST is not limited thereto. 
     An infrared ray block filter  600  may be disposed between the fifth lens  501  and the image plane IMG. However, embodiments are not limited thereto, and the infrared ray blocking filter  600  may be omitted. Alternatively, both or one of the infrared ray blocking filter  600  and a cover glass may be disposed. 
     The first lens  101  through the fifth lens  501  may be formed of a glass material or a plastic material. However, at least one of the first through fifth lenses  101  through  501  may be formed of a plastic material to achieve weight lightening. To achieve aberration correction, at least one of the first through fifth lenses  101  through  501  may employ an aspherical surface as at least one surface. In this case, the at least one lens employing an aspherical surface may be formed of a plastic material to achieve process easiness. All of the first through fifth lenses  101  through  501  may be implemented as aspherical plastic lenses in order to achieve aberration correction, weight lightening, and cost reduction. 
     Lens data according to several embodiments of the present invention will now be described in detail. In the lens data, ST indicates a stop, and an indication * behind a surface numeral indicates that a corresponding surface is aspherical. In the lens data, R, T, Nd, and Vd indicate the radius of curvature, a thickness or interval, a refractive index, and an Abbe&#39;s number, respectively. In the lens data, Fno. indicates the number of F, and f indicates a focal length. The units of the focal length, the radius of curvature, and the thickness or interval are each mm. 
     The aspherical surface is defined as follows. 
     
       
         
           
             
                 
             
             ⁢ 
             
               [ 
               
                 Equation 
                 ⁢ 
                 
                     
                 
                 ⁢ 
                 1 
               
               ] 
             
           
         
       
       
         
           
             Z 
             = 
             
               
                 
                   Y 
                   2 
                 
                 
                   R 
                   ( 
                   
                     1 
                     + 
                     
                       
                         1 
                         - 
                         
                           
                             ( 
                             
                               1 
                               + 
                               K 
                             
                             ) 
                           
                           ⁢ 
                           
                             
                               Y 
                               2 
                             
                             / 
                             
                               R 
                               2 
                             
                           
                         
                       
                     
                   
                 
               
               + 
               
                 AY 
                 4 
               
               + 
               
                 BY 
                 6 
               
               + 
               
                 CY 
                 8 
               
               + 
               
                 DY 
                 10 
               
             
           
         
       
     
     where Z denotes a distance from a vertex of a lens along an opitcal axis, Y denotes a distance from the vertex of the lens in a direction perpendicular to the optical axis, K denotes a conic constant, A, B, C, and D denote aspherical coefficients, and R denotes the radius of curvature of the vertex of the lens. 
     &lt;Embodiment 1&gt; 
       FIG. 1  illustrates an optical arrangement of the photographic lens  1000  according to Embodiment 1, and lens data according to Embodiment 1 is as follows. 
     
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 FNo. = 2.29/f = 2.0587 mm 
               
             
          
           
               
                 Surface 
                 R 
                 T 
                 Nd 
                 Vd 
               
               
                   
               
             
          
           
               
                 1  
                 Infinity 
                 0.2 
                   
                   
               
               
                 ST 
                 Infinity 
                 −0.2 
                   
                   
               
               
                 3* 
                 1.4564 
                 0.692 
                 1.546 
                 56.093 
               
               
                 4* 
                 −10.8117 
                 0.05 
                   
                   
               
               
                 5* 
                 19.7351 
                 0.25 
                 1.645 
                 23.518 
               
               
                 6* 
                 2.261 
                 0.3113 
                   
                   
               
               
                 7* 
                 21.8084 
                 0.2575 
                 1.645 
                 23.518 
               
               
                 8* 
                 50.5462 
                 0.2825 
                   
                   
               
               
                 9* 
                 −2.794 
                 0.791 
                 1.546 
                 56.093 
               
               
                 10*  
                 −0.8062 
                 0.1557 
                   
                   
               
               
                 11*  
                 −10.2271 
                 0.35 
                 1.546 
                 56.093 
               
               
                 12*  
                 0.9792 
                 0.2 
                   
                   
               
               
                 13  
                 Infinity 
                 0.21 
                   
                   
               
               
                 14  
                 Infinity 
                 0.87 
                   
                   
               
               
                 IMG 
                 Infinity 
                 0 
               
               
                   
               
             
          
         
       
     
     Table 2 below shows an aspherical coefficient. 
     
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 Surface 
                 K 
                 A 
                 B 
                 C 
                 D 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 3 
                 −0.2039 
                 −0.0082 
                 0.0563 
                 −0.3696 
                 1.072 
               
               
                 4 
                 0 
                 −0.0458 
                 0.3216 
                 −1.2289 
                 2.015 
               
               
                 5 
                 0 
                 −0.0614 
                 0.5346 
                 −1.5502 
                 2.3777 
               
               
                 6 
                 2.9353 
                 −0.0868 
                 0.3843 
                 −0.8119 
                 1.2546 
               
               
                 7 
                 0 
                 −0.2262 
                 0.1718 
                 −0.5433 
                 1.7087 
               
               
                 8 
                 0 
                 −0.1687 
                 0.1866 
                 −0.5564 
                 1.3161 
               
               
                 9 
                 −8.0758 
                 −0.0519 
                 0.1285 
                 −0.3981 
                 0.6533 
               
               
                 10 
                 −4.3635 
                 −0.1394 
                 0.2634 
                 −0.3975 
                 0.3782 
               
               
                 11 
                 0 
                 −0.0287 
                 −0.0763 
                  0.0627 
                 −0.0164 
               
               
                 12 
                 −8.4837 
                 −0.1023 
                 0.04 
                 −0.0129 
                 0.0009 
               
               
                   
               
             
          
         
       
     
       FIG. 2  illustrates a longitudinal spherical aberration, astigmatic field curves, and distortion of a photographic lens optical system according to Embodiment 1. Longitudinal spherical aberrations are shown for light beams having wavelengths of 650 (nm), 610 (nm), 555 (nm), 510 (nm), and 470 (nm), respectively, and astigmatic field curves and distortion are shown for the light beam having a wavelength of 555 (nm). In an astigmatic field curve graph, a sagittal field curvature and a tangential field curvature are indicated by S and T, respectively. 
     &lt;Embodiment 2&gt; 
       FIG. 3  illustrates an optical arrangement of a photographic lens  2000  according to Embodiment 2. 
     Referring to  FIG. 3 , the photographic lens  2000  includes a first lens  102  having positive refractive power, a second lens  202  having negative refractive power, a third lens  302  having positive refractive power, a fourth lens  402  having positive refractive power, and a fifth lens  502  having negative refractive power, which are sequentially arranged in a direction from the object OBJ to the image plane IMG. 
     Lens data according to Embodiment 2 is as follows. 
     
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 FNo. = 2.09/f = 1.3985 mm 
               
             
          
           
               
                 Surface 
                 R 
                 T 
                 Nd 
                 Vd 
               
               
                   
               
             
          
           
               
                 1  
                 Infinity 
                 0.2 
                   
                   
               
               
                 ST 
                 Infinity 
                 −0.2 
                   
                   
               
               
                 3* 
                 1.3283 
                 0.5752 
                 1.546 
                 56.093 
               
               
                 4* 
                 189.106 
                 0.0441 
                   
                   
               
               
                 5* 
                 11.3802 
                 0.23 
                 1.656 
                 21.465 
               
               
                 6* 
                 2.2696 
                 0.2876 
                   
                   
               
               
                 7* 
                 −100 
                 0.2705 
                 1.656 
                 21.465 
               
               
                 8* 
                 −39.6464 
                 0.3283 
                   
                   
               
               
                 9* 
                 −3.3069 
                 0.7201 
                 1.546 
                 56.093 
               
               
                 10*  
                 −0.7903 
                 0.1542 
                   
                   
               
               
                 11*  
                 −26.188 
                 0.33 
                 1.546 
                 56.093 
               
               
                 12*  
                 0.8859 
                 0.22 
                   
                   
               
               
                 13  
                 Infinity 
                 0.21 
                   
                   
               
               
                 14  
                 Infinity 
                 0.7981 
                   
                   
               
               
                 IMG 
                 Infinity 
                 0.0019 
               
               
                   
               
             
          
         
       
     
     Table 4 below shows an aspherical coefficient. 
     
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 4 
               
               
                   
               
               
                 Surface 
                 K 
                 A 
                 B 
                 C 
                 D 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 3 
                 −0.1592 
                 −0.0154 
                 0.2495 
                 −1.7092 
                 6.4441 
               
               
                 4 
                 0 
                 −0.0988 
                 0.4052 
                 −0.6025 
                 −1.7643 
               
               
                 5 
                 0 
                 −0.1149 
                 0.6015 
                 0.4811 
                 −14.6129 
               
               
                 6 
                 4.2159 
                 −0.069 
                 0.2188 
                 0.9226 
                 −7.4488 
               
               
                 7 
                 0 
                 −0.1762 
                 −0.2475 
                 2.2472 
                 −14.7248 
               
               
                 8 
                 0 
                 −0.0896 
                 −0.2148 
                 1.1579 
                 −4.7494 
               
               
                 9 
                 −16.9644 
                 −0.0161 
                 0.1256 
                 −0.5836 
                 1.2702 
               
               
                 10 
                 −4.0158 
                 −0.0753 
                 0.152 
                 −0.3203 
                 0.4183 
               
               
                 11 
                 0 
                 −0.0847 
                 −0.0438 
                 0.0621 
                 −0.0203 
               
               
                 12 
                 −6.9413 
                 −0.1582 
                 0.1282 
                 −0.0937 
                 0.0487 
               
               
                   
               
             
          
         
       
     
       FIG. 4  illustrates a longitudinal spherical aberration, astigmatic field curves, and distortion of the photographic lens  2000  according to Embodiment 2. 
     &lt;Embodiment 3&gt; 
       FIG. 5  illustrates an optical arrangement of a photographic lens  3000  according to Embodiment 3. 
     Referring to  FIG. 5 , the photographic lens  3000  includes a first lens  103  having positive refractive power, a second lens  203  having negative refractive power, a third lens  303  having positive refractive power, a fourth lens  403  having positive refractive power, and a fifth lens  503  having negative refractive power, which are sequentially arranged in a direction from the object OBJ to the image plane IMG. 
     Lens data according to Embodiment 3 is as follows. 
     
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 5 
               
             
             
               
                   
               
               
                 FNo. = 2.09/f = 3.45 mm 
               
             
          
           
               
                   
                 Surface 
                 R 
                 T 
                 Nd 
                 Vd 
               
               
                   
               
             
          
           
               
                   
                 1  
                 Infinity 
                 0.2 
                   
                   
               
               
                   
                 ST 
                 Infinity 
                 −0.2 
                   
                   
               
               
                   
                 3* 
                 1.3428 
                 0.6011 
                 1.546 
                 56.093 
               
               
                   
                 4* 
                 −91.6234 
                 0.03 
                   
                   
               
               
                   
                 5* 
                 14.3967 
                 0.23 
                 1.656 
                 21.465 
               
               
                   
                 6* 
                 2.3329 
                 0.2878 
                   
                   
               
               
                   
                 7* 
                 10.3232 
                 0.2769 
                 1.645 
                 23.518 
               
               
                   
                 8* 
                 12.1625 
                 0.2946 
                   
                   
               
               
                   
                 9* 
                 −3.0533 
                 0.7496 
                 1.546 
                 56.093 
               
               
                   
                 10*  
                 −0.7067 
                 0.0965 
                   
                   
               
               
                   
                 11*  
                 −93.6421 
                 0.3435 
                 1.546 
                 56.093 
               
               
                   
                 12*  
                 0.7712 
                 0.23 
                   
                   
               
               
                   
                 13  
                 Infinity 
                 0.21 
                   
                   
               
               
                   
                 14  
                 Infinity 
                 0.8196 
                   
                   
               
               
                   
                 IMG 
                 Infinity 
                 0.0004 
               
               
                   
               
             
          
         
       
     
     Table 6 below shows an aspherical coefficient. 
     
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
               
                 Surface 
                 K 
                 A 
                 B 
                 C 
                 D 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 3 
                 −0.1812 
                 −0.0225 
                 0.3504 
                 −2.5334 
                 10.0997 
               
               
                 4 
                 0 
                 −0.1814 
                 1.1035 
                 −4.1571 
                 10.4912 
               
               
                 5 
                 0 
                 −0.1818 
                 1.1414 
                 −1.7573 
                 −8.6185 
               
               
                 6 
                 4.2487 
                 −0.0958 
                 0.6204 
                 −2.4281 
                 10.4555 
               
               
                 7 
                 0 
                 −0.2076 
                 0.2619 
                 −2.4761 
                 13.4549 
               
               
                 8 
                 0 
                 −0.1116 
                 −0.0142 
                  0.1908 
                 −1.6029 
               
               
                 9 
                 −16.6517 
                 −0.0493 
                 0.1893 
                 −0.6945 
                 1.5076 
               
               
                 10 
                 −4.145 
                 −0.1246 
                 0.1666 
                 −0.1484 
                 −0.0196 
               
               
                 11 
                 0 
                 −0.1183 
                 0.0479 
                 −0.0621 
                 0.0723 
               
               
                 12 
                 −7.1745 
                 −0.1535 
                 0.129 
                 −0.0992 
                 0.0534 
               
               
                   
               
             
          
         
       
     
       FIG. 6  illustrates a longitudinal spherical aberration, astigmatic field curves, and distortion of the photographic lens  3000  according to Embodiment 3. 
     Table 7 below shows that the photographic lenses  1000 - 3000  according to Embodiments 1-3 meet Conditions (1), (2), (3), and (4). 
     
       
         
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 7 
               
               
                   
               
               
                   
                 Embodiment 
                 Embodiment 
                 Embodiment 
               
               
                 Classification 
                 1 
                 2 
                 3 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Condition 
                 FOV 
                 77.04 
                 81.2 
                 81.84 
               
               
                 (1) 
                   
                   
                   
                   
               
               
                 Condition 
                 TTL 
                 4.45 
                 4.2 
                 4.2 
               
               
                 (2) 
                 imgH 
                 3.05 
                 3.05 
                 3.05 
               
               
                   
                 TTL/imgH 
                 1.46 
                 1.38 
                 1.38 
               
               
                 Condition 
                 f 
                 3.75 
                 3.49 
                 3.45 
               
               
                 (3) 
                 BFL 
                 1.28 
                 1.23 
                 1.26 
               
               
                   
                 BFL/f 
                 0.34 
                 0.35 
                 0.37 
               
               
                 Condition 
                 Ind2 
                 1.64 
                 1.66 
                 1.66 
               
               
                 (4) 
                 Ind3 
                 1.64 
                 1.66 
                 1.64 
               
               
                   
                 (Ind2 + Ind3)/2 
                 1.64 
                 1.66 
                 1.65 
               
               
                   
               
             
          
         
       
     
     The above-described embodiments provide photographic lenses having compact and light structures and achieving smooth aberration correction and a super wide angle. 
     Each of the photographic lenses facilitates aberration correction by using five lenses, and has a compact and light structure. 
     Each of the photographic lenses includes an aspherical lens formed of a plastic material, and thus produces a cost-effective and high-performance optical system. 
     The photographic lenses may be compact and also accomplish a wide angle. 
     Photographic lenses according to embodiments may be applied to various types of photographic apparatuses, together with image sensors which convert optical images formed via the photographic lenses into electrical signals. The photographic apparatuses may be employed in various electronic apparatuses, for example, mobile terminals, door phones, and cars. 
     It should be understood that the exemplary embodiments described therein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.