I have one of those 210mm Caltar II-E lenses. It is compact, uses small filters, 49mm I think, and is sharp when stopped down to f/22. It is a multicoated a three element lens. If you could replicate dpn's purchase of a 210mm Fujinon NW, that would be a great deal. Those lenses are excellent. It is a more complex optical design than the aforementioned Caltar. It has a larger image circle too. I have two other focal length Fujinon NW lenses and they are very nice.
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