210 is a wonderful length for portraits on 4x5. A Xenar is (correct me if I'm mistaken) a Tessar design.
I
prefer Tessars for portraits. Here is an
example shot made with a 250mm Carl Zeiss Jena Tessar on 4x5.
What kind of aperture does it have ? By that I mean, how many blades ? If it has many blades, then it will have a circular aperture - which will help give a smooth blur rendition. Below is one that has 18 blades. It's coated, fairly new, but in barrel.
If I were buying a Tessar for portraits, I'd get one in an old shutter - because those have wonderful circular apertures. They are generally cheap because people think that a new shutter will be better. When I tested my vintage shutters with a Calumet Shutter Tester, I found the speeds to be quite accurate.
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