Upload & Sell: On
After giving up on converting a mint, Canon FD 50L lens (well known camera shop wanted $800 for EOS conversion) which is for sale by the way, I've finally acquired a nice condition, late FL55 1.2 lens and converted it to EOS. The jury is still out on its performance...
The conversion was quite easy. I used a bronze/chrome M42 adapter, which was just wide enough for the rear element to clear. I then drilled 3 very precise holes from the front side, using the removed FL piece as a template. Then from the back side of the adapter, I milled down the stock to the flat plate. The nice thing about this is the bolt pattern is right on the thick ridge of the EF flange and as such the original screw heads need not be countersunk, or the flat plate area weakened by making the screws flush.
Also, I did NO sanding of the adapter to reduce the optical path for infiinity focus. Taking tmessenger's description of the focus assembly, I used the focus stop to bring the assembly back to infinity focus.
The "A---M" switch is fully functional for stopdown/wide open of the aperture.
I was prompted to do this exercise due to the successful conversions and photos I've read about here, and the lens is very fun to play with. However, I don't think I am getting the full effect of the fast aperture, or lens performance with a crop Canon, as alot of the OOF areas are cropped out. Maybe, I need a full frame sensor, then I can get the same depth of focus plane with a better performing 1.4 lens or indeed my trusty Summicron-R.