174531 ⎘
Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group arranged +--
Zoom lens unit, imaging device, and monitoring video camera
#2Electronic device including optical system having a telephoto lens
#3Optical system and imaging apparatus including the same
#4Zoom lens and image pickup apparatus having the same
#5Zoom lens unit, imaging device, and monitoring video camera
#6Zoom lens and imaging apparatus