Speed Booster for NEX bodies and Leica R lenses, uncomplete compatibility list ...
JeanPierreC | Product Reviews & Previews | Published Apr 22, 2013
My Summicron R 1:2 35 mm could not fit in the Speed Booster.
There is a part in the Leica mount to protect the rear glass.
David (Leitax) wrote to me that I could file it a bit and sent me the link to do it.
I did that and now it works !
I have to find the right way for a Vario-Elmar-R 4,0/35-70mm ROM.