Thanks but those "WS" lenses are really "W" lenses, not "W S" lenses. The "S" in the "WS" lenses means "series", just as it does in the "NWS" lenses. Same with "AS", "SWS", "SWDS", "NSWS", etc. I'm referring to the lenses where the "S" is set off from the other letters -- "W S". That only happened with the "W" lenses -- there are "W" inscribed lenses and "W S" inscribed lenses. No lenses are inscribed "WS". The "W S" lenses are early lenses. Here are two examples -- same lens, one is "W", the other "W S".
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