Originally Posted by zanef2.8
Perhaps a stupid question which is often asked
Is it possible to put a 35mm lens on a R3A by switching to 40mm frameline?
Do I lose a lot of the field of view in the viewfinder?
Certainly possible, but it is a matter of personal taste if you like the arrangement. If you use the full viewfinder (including the slight margin outside the 40mm frame), it will probably be about right.
Since R3A is 1:1, you should be fine if you shoot with both eyes open, and use the full visible area of the viewfinder as as 35mm 'frameline'.
I did not try it personally though. Being obliged to wear spectacles makes the r3 viewfinder inconvenient at the wider framelines, and for that reason I went for R2M. But I have tried R3x viewfinder in the store, and at the time I thought the full viewfinder might be usable as 35mm frameline, and right-eyed users without glasses can use the left eye to see outside the frame.