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12:11, 10 September 2022 Francis Flinch talk contribs created page Uppendahl prism (←Created page with ' An '''Uppendahl prism''' <ref>D.R. Patent Nr. 195467, 7. Februar 1907</ref> is an erecting prism, ie a special reflection prism that is used to invert an image (rotation by 180°). The erecting system consists of three partial prisms cemented together made of optical glass with a high refractive index and is <ref>R. Liebmann: ''Geradsichtige Feldstecher-Prismenumkehrsysteme ohne oder mit nur geringem Achsversatz'', In: ''Optik'' Nr. 26, Heft 3, 1967/1...')