PHOTOMETRIC OPTICAL SYSTEM FOR REAL IMAGE SYSTEM FINDER

摘要

PURPOSE:To make a real image system finder compact by combining an optical path between a condensing lens for photometry and an image reforming lens through a translucent mirror. CONSTITUTION:An incident luminous flux is formed into an image as a real image nearly at the position of a condenser 3 by an objective lens system 1 and divided into two fluxes by the translucent mirror 4. Either of them is made incident on an ocular system 2 and the other is made incident on the condensing lens 5 as the luminous flux for photometry. A reflection means 6 projects the light beam to the mirror 4 side again while the light beam is condensed by the action of the lens 5. The luminous flux for photometry 'which is projected from the condensing lens 5 for photometry while it is focused and reflected by the translucent mirror 4' is formed into the image again on a photometry element 10 by the image reforming lens 9.