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8 MM film projector wide angle objective - has forward negative convex lens group and rear positive lens group with bi-concave first lens
8 MM film projector wide angle objective - has forward negative convex lens group and rear positive lens group with bi-concave first lens
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机译:8毫米电影放映机广角物镜-具有前负凸透镜组和后正透镜组以及双凹第一透镜
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摘要
The wide angle objective is for cassette 8 mm film projectors, with which a high focal distance is required. The objective is formed by a front negative lens group (G1) comprising a bi-convex lense (1) and a dispersing meniscus (2), and a rear positive lens group (G2) comprising three individual lenses (3,4,5) and a combined lense (6,7). The first lens (3) in the positive group is bi-concave.
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