| CPC G02B 13/02 (2013.01) [G02B 9/64 (2013.01); G02B 27/646 (2013.01)] | 16 Claims |
|
1. An optical system comprising a first lens unit having positive refractive power, a second lens unit having positive or negative refractive power and configured to move in focusing, and a third lens unit having negative refractive power that are arranged in order from an object side to an image side,
wherein each distance between adjacent lens units changes in focusing, and
wherein the optical system satisfies the following conditional inequalities:
0.10<TL3/TL<0.40,
0.70<SD3/TL3<0.90,
0.05<DM3/TL3<0.14,
−0.218≤f3/f<−0.10, and
73<vd3P<97
where TL is a distance on an optical axis from a lens surface closest to the object side to a lens surface closest to the image side, TL3 is a distance on the optical axis from a lens surface closest to the object side in the third lens unit to a lens surface closest to the image side in the third lens unit, SD3 is a sum of thicknesses, on the optical axis, of lenses in the third lens unit, DM3 is the largest of the thicknesses, on the optical axis, of the lenses in the third lens unit, f3 is a focal length of the third lens unit, f is a focal length of the optical system at infinity focusing, vd3P is an Abbe number of a lens based on a d-line, and the lens having the largest Abbe number based on the d-line among positive lenses included in the third lens unit.
|