Patent ID: 8301023
Filing Date: 2012-10-30
Classification: G03B

Abstract:
1. A lens apparatus including a focus lens which is driven for bringing a desired subject into focus, a zoom lens which is driven for changing a focal length, and a diaphragm having an aperture diameter which is changed for adjusting an amount of photography light and adjusting a position of the focus lens to perform a flange back distance adjustment, the lens apparatus comprising: a diaphragm control device which changes the aperture diameter of the diaphragm at a time of mode transition between a photography mode in which a normal photographing operation is possible and an adjustment mode in which the flange back distance adjustment is possible, wherein, at a time of transition from the adjustment mode to the photography mode, the diaphragm control device changes the aperture diameter of the diaphragm to a minimum value, and then returns the aperture diameter to an original state of the aperture diameter.