| 摘要 |
PURPOSE:To raise the magnification as a telephoto auxiliary lens and make a lens system compact by constituting the rear lens group of a Keplerian telephoto auxiliary lens with a concave lens group, a convex lens group, and a convex lens group arranged in order from the object side and forming both faces of the center lens into aspherical surfaces. CONSTITUTION:A telephoto auxiliary lens 1 consists of a front barrel 1a and a rear barrel 1b engaged freely turnably with each other by a screw 3. A cemented lens where a positive lens 41 and a negative lens 42 are joined and a front lens group 4 consisting of a negative lens 43 and a positive lens 44 are attached to the front barrel 1a. A field lens 5 and a rear lens group 6 consisting of a double concave negative lens 61, a positive lens 62 whose both faces are aspherical, and a cemented positive lens of positive lenses 63 and 64 in order from the object side are attached to the rear barrel 1b.
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