Originally posted by glinda Nice ; but , how did you convert , the lens ?
Lens was converted by removing the Canon mount, machining the lens body down to attain proper Pentax K registry distance, and then installing a spare part K mount on the Canon lens. It was not a major task for an experienced machinist. We had to countersink mounting holes to fasten the K mount to the Canon lens body, maybe the most difficult part. I have two of these lenses, a Canon-FD 55mm f 1.2 as well as an older Canon-FL 55mm f 1.2. These are great lenses to shoot wide open to create narrow focus plane effects and great bokeh, but as ordinary lenses, of course, it does not do to compare them directly to precision lenses of today with their modern multiple layer coatings and aspherical elements.