Patent ID: 7768719

Claim:
A super wide angle optical system comprising sequentially from an object side: a first lens group comprising one or more of irrotational symmetric lens surfaces having, overall, a negative refractive power, wherein the first lens group comprises, in order from the object side a first lens including an object-side surface convex to the object side and an image-side surface concave to an image side and having a negative refractive power, a second lens including an object-side surface and an image-side surface formed of irrotational symmetric lens surfaces and having a negative refractive power, and a third lens including an object-side surface convex to the object side and having a positive refractive power; an aperture stop to intercept unnecessary light; and a second lens group comprising one or more of irrotational symmetric lens surfaces and having, overall, a positive refractive power, in order from the object side, wherein the second lens group comprises, in order from the object side a fourth lens including an object-side surface convex to the object-side and an image-side surface convex to the image side and having a positive refractive power, a fifth lens including an object-side surface concave to the image side and an image-side surface concave to the object side and having a negative refractive power, and a sixth lens including an object-side surface and an image-side surface formed of irrotational symmetric lens surfaces and having a positive refractive power.