PJ, you write "The traditional moderate telephoto focal length on 35mm film cameras was a 135mm lens. Why 135?" I suspect 135 mm was considered pretty long as a tele lens circa 1960s & 70s, and pretty easy to manufacture in a reasonably heavy metal body at a reasonable cost. Remember there were no computer aided designs then. You have a good point when you mention "135 was the "normal" focal length for a fairly popular group of roll and sheet film cameras so good designs were available to be adapted as starting points for 35mm cameras. If you look at most telephoto lenses for 35mm, the traditional focal lengths seem to have more to do with existing designs for other film formats than anything else." Regards. Bipin.
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