Some older cameras had been fitted with convertible lenses (German: Satzobjektiv) of usual focal duration. The entrance aspect could possibly be unscrewed, leaving a lens of twice the focal length, and 50 % the angle of check out and 50 % the aperture. The less complicated 50 %-lens was of enough high quality with the slender angle of view and litt

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This segment desires extra citations for verification. Remember to assistance boost this short article by introducing citations to reputable sources With this section. Unsourced substance may very well be challenged and taken out. (March 2012) (Learn the way and when to get rid of this template concept)???? ??? ?? ??? ??? ??????. ??? ??? ??? ?? ???

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