Hello, I have been contemplating the seemingly excellent specs of Calumet's Caltar II E 210. Being primarily a backpack guy, that lightweightness is attractive, large enough image circle, yet don't like the 49mm image filter size, but can be obviously adapted down to(other lenses 52 or 67). Has anyone ha d any experience with this lens, its characteristics, its sharpness, its contrast? Than
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