Finder optical system for single reflex cameras

摘要

A finder optical system for single reflex cameras is provided with a photographing lens, an optical path splitting device splitting a beam of light emanating from the photographing lens into two beams and directing one beam to a photographing system and directing the other to an observing system, and an electronic image pickup device disposed in the photographing system and having an image pickup surface for receiving an image formed by the light beam and a Porro prism for forming an orthographic image, and an eyepiece disposed in the observing system. Thus, the finder optical system for single reflex cameras can be provided which is simple in structure, small in size, and has a low manufacturing cost.