All About Photographic Lenses. Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
Ross London 5 in (127 mm) f/ 4 patent Wide Angle xpres E.M.I. ref. № 14a/843 (14a/1101)
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