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照相镜头摄影距离刻度标记
Photographic distance scale markings of photographic lenses
价格：￥0.00
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缩微摄影镜头技术条件
Specifications for microphotographic lenses
价格：￥0.00
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透明缩微品阅读器镜头技术条件
Specifications of reader lenses for transparent microforms
价格：￥0.00
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照相镜头的色贡献指数
Colour contribution index of camera lenses
价格：￥0.00
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电影摄影物镜的有效孔径、F数及相对孔径的测定方法
Method for measurement of effective aperture, F-number and relative aperture of motion picture lenses
价格：￥0.00
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