Interesting question. I just looked through the viewfinder of my IIIg and through my Voigtländer 35mm external viewfinder. The Voigtländer field of view is definitely wider than the full field of view of the IIIg. And the eye point height of the IIIg viewfinder is short enough that I can't see much outside the 50mm bright lines without moving my eye around. It might be usable for a 40mm lens but only with the camera on a tripod so moving my eye around wouldn't be an issue.
Like @Doug A, I can't really see anything outside of the IIIg's 50mm framelines, but if I take my glasses off and really hunt around, I could probably estimate a 40mm FoV. Definitely not a 35mm one, however.
A late Leotax with 50mm framelines like the Elite/T2L has more eye relief in the finder, but even that only really gets to 40mm at a push.
Agreed, I use a IIIg most of the time and even 40mm is pushing it. There's not a lot of field of view outside the 50mm bright lines, much like the M2 with 35mm. If you want to use a 35mm lens on the IIIg, you could get a SBLOO, which is one of the nicest viewfinders in existence.
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