Hi Frankl: The Jupiter 12 is undoubtly a sharp lens from corner to corner. The one thing thing that you have to be careful with is mounting and dismounting the lens. The rear glass protrudes a bit. The next test will be to load some color neg film and shoot some at the park and scan them. No I didn't use any filter. This lens will work nicely with a FED2 the only problem is with those new voightlander rf cameras. Don

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