Originally Posted by Jamie123
It looks like it's the standard lens which can be removed by unscrewing the retaining ring (like any other LF lens). However, it seems that any lens with a focal length that's too different from the standard one would run into problems with the focus range.
you are right for the first sentence. there is no problem for the focus range with 90mm, 150mm and maybe 210mm. I can use both ground glass or rangefinder for focusing. I set the length of bellow for infinity lock position and do the same for viewfinder. after that, I can use rangefinder system for focusing any thing at any distance.
but the frame view on rangefinder system is correct for standard lens only