US 12,092,804 B2
Optical system, optical apparatus and method for manufacturing the optical system
Keisuke Tsubonoya, Yokohama (JP)
Assigned to Nikon Corporation, Tokyo (JP)
Filed by Nikon Corporation, Tokyo (JP)
Filed on Jun. 28, 2023, as Appl. No. 18/215,306.
Application 18/215,306 is a division of application No. 17/624,827, granted, now 11,733,499, previously published as PCT/JP2020/024055, filed on Jun. 19, 2020.
Claims priority of application No. 2019-127589 (JP), filed on Jul. 9, 2019; application No. 2019-127590 (JP), filed on Jul. 9, 2019; and application No. 2019-127591 (JP), filed on Jul. 9, 2019.
Prior Publication US 2023/0341666 A1, Oct. 26, 2023
Int. Cl. G02B 15/22 (2006.01)
CPC G02B 15/22 (2013.01) 23 Claims
OG exemplary drawing
 
1. An optical system comprising a plurality of lens groups arranged along an optical axis, comprising:
a first focusing lens group and a second focusing lens group, the first focusing lens group and the second focusing lens group being moved upon focusing,
wherein
the following conditional expressions are satisfied:
1.30<fF1/f<5.00,
25.000<2ω<75.00°,
where
fF1: a focal length of the first focusing lens group,
f: a focal length of the entire optical system, and
2ω: a total angle of view of the optical system.