Quote Originally Posted by Dan Fromm
Um, Ole, if I have it right threading for UK-made lenses was standardized -- RPS standard, described somewhere in the Vade Mecum -- by the time RR lenses came in. But Wayne's is US-made, by Ilex in Rochester, NY so if its threading conforms to a standard the standard probably isn't the RPS one.

Also, are you sure that RRs are anastigmatic?


TYPO ALERT: For "anastigmat" read "Aplanat". I'll fix it in my original post too - thanks for noticing!

As to "standardised threads": This was a result of a standardisation of barrel diameters, whch was fairly easy in the UK since there were only two or three barrel makers supplying all the opticians. But out of the old British lenses I have, only one has one of these "standard threads".