Single focus lens system and photographing apparatus including the same

A photographing apparatus comprising:

• a single focus lens system;
• and
• an imaging device receiving an image formed by the single focus lens system,
• wherein the single focus lens system comprises a first lens group having a negative refractive power, a stop, and a second lens group having a positive refractive power, sequentially arranged in order from an object side,
• wherein the first lens group comprises first and second air lenses having a negative refractive power, a meniscus shape and a convex surface toward the object side, and the second lens group comprises a lens that has a positive refractive power, is disposed closest to the object side, and has a convex surface toward the object side,
• wherein the single focus lens system satisfies the following expression,
• −10<Fair1/F<−2.5
• −6<Fair2/F<−1
• 0.6<Fp2/F<1.5,
• where F denotes an overall focal length, Fair1 denotes a focal length of the first air lens of the first lens group, Fair2 denotes a focal length of the second air lens of the first lens group, and Fp2 denotes a focal length of the lens of the second lens group.