Correct filters/hoods...does it really matter?
I'm looking into some Leica LTM lenses but many people dislike the old filter threads (Summitar, Summarit, etc.).
Yeah it would be great if they were 39mm but can't one just adapt? Step up rings are readily available.
I use 50mm Canon/Nikon LTM lenses and just adapt them all to 46mm. I figured that the largest diameter lens that I would consider , at the time, is 46mm so I made that standard. My understanding, at the time, was that the correct shades were oftentimes collector items so I didn't bother pursuing them. I went with heavystar. No issues but my coatings are better than the Leica LTM ones.
I would, I think, standard to 39mm too, because I do not use that many filters and a lot of the lenses that I'm considering now are at that filter thread (M and LTM).