Title: Optical system for effecting indication within a finder in a single lens reflex camera

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Abstract: In a single lens reflex camera having a focusing plate, a pentaroof-prism and an eyepiece, an optical system for indicating information within the view field of the finder includes first prism means disposed on the principal optical axis of the finder between the pentaroof-prism and the eyepiece. The incidence surface of the first prism means is parallel to the emergence surface of the pentaroof-prism and the emergence surface of the first prism means forms a predetermined angle .alpha. with a horizontal plane containing the principal optical axis of the finder. A reflector member is disposed at the upper end of the front reflective surface of the pentaroof-prism and outwardly of the boundary point of the finder's view field light. An indicator member is disposed above the first prism means. Second prism means is disposed on the optical axis of the finder between the first prism means and the eyepiece. The incidence surface of the second prism means is parallel to the emergence surface of the first prism means with a slight air space provided therebetween, and the emergence surface of the second prism means is parallel to the incidence surface of the first prism means. The indicator member may be viewed from the eyepiece through the two prism means, the pentaroof-prism and the reflector member with a magnification and visibility equal to those of the finder's view field.


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