To obtain an imaging optical system that provides a sufficient amount of light to a focus detection means while suppressing a decrease in the amount of light for a photographing system and that has high focusing speed and focusing accuracy.
A lens apparatus has a focusing lens group, a separating optical system disposed on an optical axis of the lens apparatus, the focus detection means that detects focus condition using a light beam from the separating optical system, a first drive unit that drives the focusing lens group based on an output of the focus detection means, and a second drive unit that drives the separating optical system. An optical separating surface that the separating optical system has reflectance that varies continuously in a first direction. The second drive unit drives the separating optical system in the first direction.
TOMITA YASUYUKI
IZUMIHARA ISAMU
| JP2003270520A | 2003-09-25 | |||
| JP2002357762A | 2002-12-13 | |||
| JP2006235193A | 2006-09-07 |
Yuichi Uchio