I just picked up a Fujinon NW 125mm f/5.6 beauty. It is the version with 46mm front filter size (there are 52mm and 55mm front filter versions of the NW) and a 39mm rear filter thread.
The data sheets for this lens show a 48mm front push-on lens cap but do not say what the rear push-on lens cap size is.
In my experience push-on lens caps are typically at least 2mm larger than the filter thread size. This would make the required push-on rear lens cap size 41mm. However, this seems to be a size that is not manufactured by the usual brands that still produce lens caps (for example, Schneider).
Can anyone confirm what the correct size should be for a push-on lens cap to fit a 39mm rear filter thread mount?
Cheers.
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