gasrocks wrote in post #11713104
...The wide angle lenses are the hardest to convert for that reason.
I think some widenagle FD lenses do not fit to EOS 5D (without mirror shaving). But the conversion of the lens mount seems not more effort than the longer lenses - I think less.
The 85/1.2L is pretty hard due to its backlens that is fixed inside the mount.
The nFD 20/2.8 was much easier. But didn´t go to infinity on the 5D. So I don´t make it full ready.
funkyfones wrote in post #11807503
... each lens is different so no kit but similar principle.
I suppose that the iris coupling ring I made could be used on many or even all nFD lenses - it only needs some easy modification to the lens type. Here this part (the pure aluminium one):
The iris coupling is different from lens to lens, but the variation is not that big: For the longer lenses like 100/4, 300/2.8, 400/2.8 and 500/4.5 I need a crank.
Here a picture of the mentioned coupling ring with the crank mounted:
For the shorter lenses like the 85/1.2, 50/1.8, 50/2.8 and as I remember 20/2.8 you need something like a fork.
This fork or a smaller crank could be screwed direct onto FD parts - like here on the Fd 100/4 macro:
For my better conversions I tried to work full reversibel - means that I don´t like to alter original Canon Fd parts, at least not i a manner that destroys the rebuild to Canon FD mount.
For some of the longer lenses like the 300/2.8L and 400/2.8 L one need to anchor the iris assembly to the outer tube. The original part for that is no longer used in my conversion way. Another way of conversion use that part longer - but can not fix the iris to it any longer.
At my 300/2.8 I did that with glue. Not the best. On the 400/2.8 I used my lathe to build a part for that:
In that image you see the long axial screws that can be used for position of that iris mount ring before it is clamped with the beveld screws to the outer tube of the lens.
For further conversions I plan a own EF mount that is a big thicker - and as ist seems at the moment the screw holes on all nFd lenses are the same.