I just acquired a wonderful old 20x24 camera. It included a Zeiss Jena 450mm/f9 copy lens, which seems a bit wide for my taste. I am interested in purchasing a slightly longer lens with a shutter. What are the best sources for lenses that will cover 20x24? Also, is there a published guide to conversions from 20x24 lenses to 35mm equivalents? Even a general guide would help quite a bit (wide, normal, etc.).
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