Image rotating optical system
 In an optical system including an objective lens to form an image on a focusing plane and a relay lens system to carry the image to another focusing plane, an image rotating prism is inserted in the relay lens system and a field lens is provided between the objective lens and the relay lens. The pupil of the relay lens system is positioned at the center of the optical path of the prism by properly selecting the power of the field lens. 
Fuji Photo Optical Co., Ltd.
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G02B G02B G03B
inventional inventional inventional
Yoshikazu Hiroshi Toshiro
Doi Yamada Kishikawa