Fotodiox Pro Lens Mount Adapter - Rolleiflex SL66 (SL66E/SL66X/SL66SE) to Canon EOS EF/EF-S DSLR Camera with Built-in Focusing Helicoid - Perfect for Vintage Lens Photography & Digital Conversion Projects

In short, This did exactly what I wanted it to. it allows me the use of my old FD mount lenses on a EOS/EFS body, and does an extremely good job at it. construction of it is solid no looseness at all. have had no problem mounting any lens to it. I would buy again and have already recommended it to my friends with the same interest.In more detail, This adaptor does exactly what it said it would. the instructions were very clear. and packed very nicely. it's compact enough to take next to no room in any camera bag. and the thing I was most concerned about, I've read advisories about these adapters (Not this brand but as a whole) blocking the mirror from flipping properly from being too close into the body. This one did not have that problem at all. Another concern was it's ability to support weight. the old FD lenses were not lite being made of glass and metal, but this has been no problem at all I've had a telephoto hooked up to it without any concern of it falling off or worse yet damaging the mount's on the camera body. as I said at the start the adapter is made very well. of nice metal and glass there is nothing on it at all that would make me feel like it was cheap. If I could change one thing it would be the color. the bright blue ring stands out like a sore thumb. but hey you're taking pictures of other things so in the long run it does not matter how it looks doing it.As you could imagine using a FD lens you'll lose all your snazzy features that the lenses of today offer you. there is no image stabilizer so for someone like me that's a little of a set back I can tend to bump the camera at times so a tripod is almost a must, there is no autofocus it's all done by manual (I mainly shoot with MF at any rate though) aperture is semi manual. you do have the ability to set the light sensitivity of your camera and than adjust the lens aperture but that leads into a trick I'll detail in a second, as a whole this is a amazing adapter that I wont be without from now on. it allows me to use all the lenses my grandfather's and uncle gave me rather letting them just become forgotten about.Depending on how your lenses were taken care of they might need to be taken in for cleaning. the ones I have gotten were always kept in a thermal camera bag and never bothered so they're great. but a lot of them have dust even meldo in them. don't let this put you off. they can be cleaned and brought back to their youth by a professional and still more cost effective than buying that lens new. different lenses are different quality. I've had amazing luck with my 70-200, 35-105, and 100 macro, but had a little bit of a love loss with a 50MM prime. it just was not as clear as I wanted it, this is in no way due to the adaptor however it's a factor of the lens itself. but the reason I brought it up is to say one lens may look bad but don't knock this adapter for that, try again and see if you can get better results.That pretty much wraps up my review of this adapter I'll now go over the trick, I found that adjusting the "Install" ring can allow you to manually over ride the aperture of the lens. I found often times when the picture was just too dark and turning your shutter time to 30 seconds didn't do much either. that turning the ring back towards the install mark would allow the image to brighten up substantially, being that the ring is free turning there are no clicks it's a great way to get that perfect brightness just like using a dimmer knob. when I get the chance I'll be uploading pictures I've taken with this and the lens used. hope I was able to answer some questions and should you have any further questions or just want to discuss it over all before buying feel free to let me know I'll be more than happy to go over it with you.