Now I get it.
Never paid attention to this factor because I never adapted legacy lenses to legacy cameras before.
I did try a few legacy MF lenses on my Sony NEX-7 (e-mount APS-C) years ago but found that the AF Sony-Zeiss lenses I have were a better experience and produced better quality images.
F-Mount (46.5mm) on e-mount (18mm) works because 46.5>18mm.
LTM (28.8mm) on F mount (46.5mm) doesn’t work because 46.5<28.8mm.
If I understand correctly, please tell me if I’m wrong:
If an LTM->F adapter were to be built (and MLU was used) the lens body would extend inside the mirror box and the aperture and focus rings would either be inaccessible inside the box or in some cases they could be larger than the lens mount ring and consequently not fit inside the box.
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