Hi,
If anyone can help, I would like to know if there is any difference in the optical design of f/4.5 "Paragon Anastigmat" and "Paragon Anastigmat Series S" lenses. I am thinking specifically in the 5-8 inch focal length range.
VM lumps them together under a combined category as a Q15 (Tessar) type. Are they one design? I cannot find a reference anywhere. There are some Ilex Catalogues on < http://cameraeccentric.com/html/info/ > but they are rather early, with one referencing a Series S" as a symmetrical which would not be Q15.
Another oddity I have found while looking on eBay is that there are non Series S lenses with low serial numbers (4 digit) that are coated, and Series S lenses with serial numbers in the 40k's which are not coated. Coatings are usually a post war feature so I would think that the non Series S lenses post date the Series S.
Is that a reasonable assumption?

Mike