The most interesting thing about tessar type lenses is the contrast which is easily the highest of any conventional lens. It has just a bit more astigmatism than some other lenses (which you will never see unless you are an optical physicist) but the overall quality is superb, see Commercial Ektar, f 6.3 Caltar, Zeiss Tessars and the coverage is always around 55 or so degrees. Usually they don't like macro a lot, they will often soften up a bit at 1:1 or closer. When you compare these with some of the wide field type lenses, you may actually have to increase the development with WF lenses when compared to tessar types.
Lynn
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