Zooming finder

A zooming viewfinder that comprises, in order from the object side, a positive first lens group, a negative second lens group that has a zooming capability and which is capable of moving along an optical axis of the viewfinder, a negative third lens group that has a half mirror surface on the pupil side, and a fourth lens group that is a positive eyepiece and which has a field-limiting frame on the side the closest to the object, said eyepiece comprising, in order from the object side, a positive lens element 4a and a negative lens element 4b which has a concave surface on the object side thereof, said viewfinder satisfying the following condition:

• 0.7<rb/f4<-0.1
• rb:
• the radius of curvature of the concave surface on the object side of the lens element 4b;
• f4:
• the composite focal length of the fourth lens group taken as a whole.