Ian C
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About 2010, I acquired an old uncoated enlarger lens about which I had no knowledge. It was made by the German camera maker, Wirgin. Here’s a description. It appears to be 3-element, but I can't be certain, as the front cell seems to be permanently glued shut.
Thread: 1.150” = 29.21 mm ϕ x 0.5 mm p, This is probably 29.5 mm x 0.5 mm ϕ pitch. It is threaded onto a relatively thick, black-enameled brass flange having 3 mounting holes.
This was mounted on a machined cast-aluminum male helicoid of 2.728” diameter x12 threads per inch (verified with Lufkin thread-pitch gage) triple-start 60° V-thread, probably off of a very-old enlarger, or some other equipment that used a long helicoid focus.
It is uncoated and optically is a “stinker.” The metal parts are nicely finished. The aperture has no detent mechanism. The contrast is noticeably low when merely viewing through the lens. I cannot resolve grain when viewing the projection with a 25X Microsight (8.5” wide projection of 6 x 6 cm T-Max 100 negative.
I switched lenses to a 75/3.5 Beslar (Japanese-made Cooke triplet) and the grain is well resolved. Here is a rather poor photo of a 50/3.5 version with its flange.
Vintage Wirgin Wiesbaden Gewironar f=5cm 50mm 1:4.5 f/7.5 Lens - F/S from USA | eBay
Here’s a better photo, minus the mounting flange.
https://www.ebay.com/itm/312537080171
Here is some information I found on Wikipedia on the now-extinct Wirgin camera company.
https://en.wikipedia.org/wiki/Wirgin
Wirgin Wiesbaden Gewironar 1:4.5 7.5 cm
Thread: 1.150” = 29.21 mm ϕ x 0.5 mm p, This is probably 29.5 mm x 0.5 mm ϕ pitch. It is threaded onto a relatively thick, black-enameled brass flange having 3 mounting holes.
This was mounted on a machined cast-aluminum male helicoid of 2.728” diameter x12 threads per inch (verified with Lufkin thread-pitch gage) triple-start 60° V-thread, probably off of a very-old enlarger, or some other equipment that used a long helicoid focus.
It is uncoated and optically is a “stinker.” The metal parts are nicely finished. The aperture has no detent mechanism. The contrast is noticeably low when merely viewing through the lens. I cannot resolve grain when viewing the projection with a 25X Microsight (8.5” wide projection of 6 x 6 cm T-Max 100 negative.
I switched lenses to a 75/3.5 Beslar (Japanese-made Cooke triplet) and the grain is well resolved. Here is a rather poor photo of a 50/3.5 version with its flange.
Vintage Wirgin Wiesbaden Gewironar f=5cm 50mm 1:4.5 f/7.5 Lens - F/S from USA | eBay
Here’s a better photo, minus the mounting flange.
https://www.ebay.com/itm/312537080171
Here is some information I found on Wikipedia on the now-extinct Wirgin camera company.
https://en.wikipedia.org/wiki/Wirgin