I purchased a 180mm f5.6 lens for my 5X7, advertised as a Horseman/Caltar. I thought I understood that Caltar lenses were re-branded from another manufacturer.
The only marking on the len is a green chess piece knight, and the copal zero shutter is marked "Topcor".
Does anyone have an idea who made this lens, and perhaps what its coverage might be? Images made with this lens are tack sharp, but the coverage seems barely adequate for 5X7, and I'm wondering if I could do better with another.
Thanks.
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