| 摘要 |
PURPOSE:To reduce the titled optical system at its size by arranging a reducing lens, inverted combination prisms, a dividing plate, and a focus plate on the back of an opening/closing mirror. CONSTITUTION:The inverted combination prisms 3, 6, the focus plane 4 having a Fresnel lens plane to be used also as the dividing plate, the dividing plate 5, and the reducing lens 1 are arranged on the back of the mirror opening/closing the 1st reflecting surface. Under the state closing the mirror at a time other than photographing time, the optical axis of a lens 11 is made to coincide with that of a prism 2 and a finder image is obtained from light passed through a photographing lens by an eyepiece 13 arranged on the back of the prism 2. When the mirror is opened, the light reflected by a mirror 12 is reflected by a prism 15 and the reflected light is formed as an image on a film surface 16. Thus, the size of the optical system can be reduced by using the space of the opening/ closing mirror to arrange the finder prism. |
