A lens system comprising the following, fixed sequentially in order from an object side to an image side along an optical axis: an aperture stop; a first lens component; a second lens component; a third lens component; and a fourth lens component; wherein object side lens surfaces (408a, 411 a) and image side lens surfaces (408b, 411b) of the second and forth lens component (408, 411) are aspheric, the first lens component including positive refractive power, with a surface of the first lens component facing the object side including a convex shape, the second lens component including a meniscus shape and negative refractive power, with a surface of the second lens component facing the object side including a concave shape and a surface of the second lens component facing the image side including a convex shape, a surface (410a, 411a) of the third and fourth lens components facing the object side having a convex shape near the optical axis and a surface (410b, 411b) of the third and fourth lens components facing the image side having a concave shape near the optical axis, wherein object side lens surfaces (406a, 410a) and all side lens surfaces (406b, 410b) of the first and third lens component (408, 411) are aspheric; wherein the radii of curvature at the optical axis of the object size and image side of the third lens component being within 40% of each other; and wherein a ratio of a total track length of the lens system to an image circle diameter being less than 0.95 characterized in that the lens system including an F number of 2.4 or less, and a chromatic focal shift of the lens system is limited to below 45 μm across the visible spectrum. an aperture stop; a first lens component; a second lens component; a third lens component; and a fourth lens component; wherein object side lens surfaces (408a, 411 a) and image side lens surfaces (408b, 411b) of the second and forth lens component (408, 411) are aspheric, the first lens component including positive refractive power, with a surface of the first lens component facing the object side including a convex shape, the second lens component including a meniscus shape and negative refractive power, with a surface of the second lens component facing the object side including a concave shape and a surface of the second lens component facing the image side including a convex shape, a surface (410a, 411a) of the third and fourth lens components facing the object side having a convex shape near the optical axis and a surface (410b, 411b) of the third and fourth lens components facing the image side having a concave shape near the optical axis, wherein object side lens surfaces (406a, 410a) and all side lens surfaces (406b, 410b) of the first and third lens component (408, 411) are aspheric; wherein the radii of curvature at the optical axis of the object size and image side of the third lens component being within 40% of each other; and wherein a ratio of a total track length of the lens system to an image circle diameter being less than 0.95 characterized in that the lens system including an F number of 2.4 or less, and a chromatic focal shift of the lens system is limited to below 45 μm across the visible spectrum.