I just got this FD-43 focal reducing adapter from a Chinese vendor off ebay. I hope I can return it. Subscribe to see EXIF info for this image (if available) I chose FD because I have three Canon's in 50mm, 85mm, and 135mm plus some third party lenses in 28 and 135. FD makes for probably the most fiddly of all adapters and this adapter was quite fiddly. There is really just too much hardware on the back of an FD mount and when you shorten the adapter and add a lens, there isn't much room .The FD50mm barely makes it while the FD 85 fits easily. A 3rd party (Sears) 135mm hits the lens housing inside the adapter. My M42-FD ring also does not go in, so I can't adapt my Takumars to it.. The show stopper is it will not go into my EM5. The adapter's lens housing hits the lower baffles in the first camera. The lens housing, as indicated by the arrow, can be screwed deeper into the adapter to give clearance, but that changes the original optical paths. The original designer would have to machine down the shoulders on the lens housing on both ends to make this a more viable product. It does fit my EPL5 as delivered. I was going to keep it until I wrote this post and saw all the negatives in print. As far as image quality, I did try it out with the 85mm and 50mm and I would have been happy with it. $95 USD, by the way.