Okay, I checked. The label ring reads: "ILEX PARAGON ANASTIGMAT F:4.5 E.F. 8-1/2" Series S No. 50940"
And it is a Tessar, without question. It has a cemented doublet in the rear cell that is nearly plano where it faces the shutter, and two air-spaced elements in the front cell. The rear cell's focal length is 2/3rds or 3/4 the complete lens, and the front will not focus an image.It is single coated, and mounted in a No. 4 Universal with shutter speeds on the old series. Everything about the way it looks suggests the 1950's.
As to coverage, I can't say, but I always took it to have been intended as a fast normal lens for the 5x7 format.
EDIT: More searching on the Internet suggests that the Ilex-Calumet Series S Caltar 8-1/2" (215mm) f/4.8
lens is a convertible plasmat. I saw a picture of it on another forum in an Ilex shutter (looks more like a No. 3 than a No. 4) with two sets of aperture markings. Not the same lens.
Rick "just the facts" Denney
Interesting, I had deluded myself that "Series S" was meant to imply symmetrical, like the Ilex built Calumet 8-1/2 inch "Type S" lenses that preceded their arrangement with Schneider. On second thought that lens was f/4.8. You have certainly described a tessar. Thanks for checking, and sorry to get your hopes up or whatever.
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