Patent ID: 10324364

Abstract:
The lens apparatus includes: a first optical unit (FOU) changes a field curvature amount of a projection optical system (POS) by shifting in an optical axis direction (OAD) of POS, a second optical unit (SOU) including a focus adjustment unit moves during focusing and a zoom adjustment unit moves during zooming, the SOU changing projection magnification and focus position of POS by shifting in OAD of POS, a first detection unit (FDU) detecting a position of FOU, a memory stores change information regarding changes in projection magnification and focus position of POS through shift of FOU and a control unit controls SOU to shift so as to reduce changes in projection magnification and focus position of POS at the same time caused due to shift of FOU, when field curvature amount of POS is changed, based on position of FOU detected by FDU and change information stored in memory.