The photos below are initial photographs for the purposes of examining the lens for its mechanical and optical properties.
The photos in this set have not been altered and were shot handheld.
There is very little about PROSPEC lenses on the Internet, but I haven't researched too deeply yet.
125mm f8 1/125s -0.3EV ISO100
FL 90mm f3.5 1/250s -0.3EV ISO100
FL 50mm f11 1/250s -0.3EV ISO200
FL 50mm f11 1/250s -0.3EV ISO200
Very nice photos! I just got an 'Ultranar' 28-200mm f3.8-5.6 lens which appears to be identical in every way to this lens, except the brand name. The serial number of mine is similar too --- 8670001, which indicates it may even be the same series/manufacturer! I too have found my lens to be sharp and an excellent performer. I did a write up on it with some samples over at dpreview: https://www.dpreview.com/forums/thread/4557562
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