[Leica] Canon Mirror Hitting Leica R Lens

[rbaron at concentric.net (Robert D. Baron)]

Frank Dernie writes:

> I have just bought an EOS 1DsMk2, the mirror will hit the back of the 
> 19mm R lens unless about 1.5mm is removed from the top of the rearmost 
> section of the mount.

I am curious: how does one determine if the collision of mirror and lens 
will take place, without hearing a potentially very expensive sound?

I've got two Canon digitals....a 1DMk2 and a 10D....and a number of 
Leica R lenses....and I'm seeing different reports about which Leica 
lenses will work on which Canon bodies (using the appropriate S. Gandy 
or Novoflex adapter, of course). I'd like to conduct my own tests with 
my own equipment, but I don't want to break anything in the process.

--Bob