If you havent tried it already, try holding your 135 reversed on your camera, i'm pretty sure you wont be able to get focus, the focus will be inside the lens.
my two-lens stacking results havent been good but other examples on the web have been very nice. it's very lens-dependent. That said, 135 is probably too short for much> thn 1:1 with 35 or 50...200mm with a 35 would give ok mag
yes, 135 shouldnt give extra WD when reversed, it should be the other way round
if you want extra WD for your 35 put extension on the camera, that will increase the WD of a reversed short lens.
I am thinking of trying reversing my 135mm f2 or stacking two lenses. What are your thoughts using a long lens vs stacking two lenses. Whats the difference?
I tried 35mm and 50mm will there be any difference using a 135mm other than not having to be so close to the subject.