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How rare is a Voigtlander Braunschweig. Heliar 12cm f/4.5?

This focal length was "normal" for "postcard" format 122 film cameras and a Heliar this length should just cover 3x4 or quarter plate. While 122 film was still available into the ...
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1 vote

How should I follow the Tetenal Ultrafin instructions?

I must admit that the instructions from Tetenal are very hard to understand for a beginner, but the number in the A and B columns are obviously the development times for different agitation rhythms. ...
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