Hi Stephen, I use my 50mm DR on a
Panasonic GX1 M4/3 body. It's true
that the field of view is that of a 100mm
lens, no longer a 50mm, but the
advantages far outweigh that change.
GX1 bodies cost about $250 now.
The Leica M mount to M4/3 adapter
was about $100.
No need to alter the lens in any way.
You can use the close focus range
without the goggles by shifting over the
"hump", and depressing the lock
button.
Because of the crop factor the close
range gives quite significant macro
capability.
The results are astounding. Check it
out for quite a small investment!
Best wishes,
David