Originally Posted by PaulCooper
I use the G system quite often. sometimes, though I miss the long reach lens with my G2, to isolate detail. Anybody had some experience with longer lenses with GA-1 adapter on G camera?
It's not worth it. I've have had the adapter for the past 20 years and use it rarely. It only works with C/Y lenses whose filter diameter is 55mm or less.
Also larger lenses block the rangefinder as do most Contax lens hoods on 55mm filter size lenses.
This leaves you only the C/Y Sonnars f2.8 85mm (the G's f 2.8 90mm is better) and f2.8 135mm, for "longer" lenses.
The viewfinder will not show the field of view for the lens so you need an auxiliary viewfinder with the matching focal length view in the shoe. Same as we use on the old Contax rf cameras.
It works in manual focus only. Also a typical rf camera range finder is focus challanged by any lens longer than 135mm and by 135mm f2.8's.