Generally true, but one caveat:
Some lens' rear assemblies project further behind the mounting plane than others.
It's typically a non-issue on APS-C cameras due to the smaller sensor and thus,
a smaller mirror.
But due to the larger mirror required for a full-frame camera, the bottom edge
of the mirror has been known to collide with some lenses. This is much more of an
EF vs. EF-S lens issue, although I've read about vintage lenses presenting
the same scenario. Some people have actually ground some of the lower mirror
edge off to accommodate such lenses on FF cameras.
This is commonly called "mirror shaving."
It's a fairly rare scenario, but to the best of my recollection,
it's more likely to occur with the more exotic or uncommon lens mounts,
or altogether different types such as standard lenses for cine(C)-mount or
enlargers, for example.
Years ago I bookmarked a site with info on compatibility of M42 lenses on Canon's "5D "family" (MK I, II, III, 6D) when they are focussed to infinity."
The list get still updated and there are now 361 lenses on the list.
Maybe it's helpful?
https://www.panoramaplanet.de/comp/index.html#Meyer![]()







). I'm already impressed with what the SP 60-300 does with hummers @ 300mm, especially considering it's a zoom being used at/near MFD and max FL. Of all of the vintage lenses I have tried/owned the Tamron SPs impress me the most with their IQ, (in some cases extreme) versatility and affordable price.
) Their build and functioning are about as good as you can get. They lack the light weight and especially the versatility of the Tamron Adaptall lenses. And while my Nikkors don't seem to be first in any particular category they get used an awful lot. 
