| 摘要 |
PURPOSE:To perform highly accurate photometry even when a photometric lens having a small outer diameter is used by providing the photometric means and a light leading means at the position where the luminous flux of a finder passed through part of a reflecting mirror provided with a semi-transmissive surface between the front and rear groups of a secondary image forming lens reaches. CONSTITUTION:After passing through the 1st reflecting mirror 11 provided with a semi- transmissive surface, the light from the front group 10a of a secondary image forming lens system 10 is again caused to form an image on a secondary image forming surface 14 through the 2nd reflecting mirror 12 which reflects the light from the rear groups 10b of the lens system 10 toward the optical axis of a photographing lens 1 and the 3rd reflecting mirror 13 which reflects the light from the mirror 12 toward the image surface. Moreover, a light leading means 16 which leads light to a photometric means 17 is provided at the position where part of the luminous flux of the finder passed through the semi-transmissive surface of the 1st reflecting mirror 11 reaches. Therefore, TTL photometry is performed by leading part of the luminous flux of the finder onto the surface of the photometric means 17 through the light leading means 16 having a light condensing function. Therefore, an optional photometric sensitivity distribution which is suitable for an electronic camera, etc., having a relatively small photographing picture surface is easily obtained. |
