Periscopic lens
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| Ica Periskop (Image rights) |
A periscopic lens is a symmetrical lens, consisting of two equal meniscus convex lens elements with the aperture between the elements. The periscopic lenses have no correction of chromatic aberration, are free from distortion and maybe a little faster than a simple color-corrected achromatic lens. According to Ludwig David periscopic lenses were the cheap lenses for the poor.
Glossary Terms
