Patent ID: 9557540
Date: 2017-01-31
CPC Classifications: G02B,G03B,H04N

Claim:
1. A plurality of imaging optical systems comprising: at least two imaging optical systems having different focal lengths, wherein each imaging optical system in the plurality of imaging optical systems comprises in order from an object side, a front lens unit having a positive refractive power, a diaphragm member, a focusing lens unit having a negative refractive power, and a rear lens unit, and the front lens unit includes one of a positive lens and a negative lens as a common lens, and each of at least two imaging optical systems from among the plurality of imaging optical systems includes at least one common lens, and at the time of focusing, only the focusing lens unit moves on an optical axis, and each imaging optical system satisfies the following conditional expression (1), and the plurality of imaging optical systems satisfies the following conditional expression (2): where, f f denotes a focal length of an overall system of each imaging optical system at the time of infinite object point focusing, f f the maximum focal length and the minimum focal length are to be obtained by comparing absolute values of the focal lengths.