FotodioxLens Mount Adapter - Compatible with Nikon F Mount D/SLR Lenses to fit Canon EF & EF-S Mount SLR Cameras

I bought this adapter on the advice that it was a serious, superior product. It sure is. I had to put this to through the test in a unique way. I needed to adapt a 600mm Asanuma lens to a Canon EOS frame. Then the entire rig had to be incorporated into an experimental dual mount astronomical drive system to photograph the total eclipse up in Page, Arizona. There would be no room for error as the window for the eclipse was 4 minutes and 14 seconds. The idea was to take 399 sequential pictures to later turn into a time lapse film of the event. This mount couldn't suffer from light leaks, inaccurate machining, poor threading, lack of robustness, etc. The lens weighed in at a substantial amount. At site everything went together perfectly, and when the time came everything went off smoothly with no hitches. I would recommend this adapter for any situation, period. It works flawlessly and is of the highest grade. BTW that Asanuma lens is a fantastic lens (don't believe anyone writing on it that has an opinion and isn't familiar with the lens or its history). If you don't want to spend thousands of dollars for a 'new' supertelephoto lens but want to have FUN with one by all means find one of these or any of the other pre-digital lenses that can T-adapt. You can even pick up a questar telephoto if you look for them and I'll tell you this- NOTHING EVER made in the telephoto market can compete with the optics of a Questar telephoto- then and now. This adapter opens up a whole world of possibilities by making these legacy lenses once more relevant. You can now afford a boatload of them and use a single adapter to incorporate them on your camera. So you need to use it in manual mode- big deal. You should know how to do that anyways. I'll be getting more of these for my other lenses I'll be adapting to the Canon EOS frame. Best piece of equipment ever!

The results are amazing. I wish I had one of these for my Canon Ef - Sony E and vice versa.

This adapter suffers from a design flaw. I will get to in a minute which Nikon/EOS adapter to get.When I turn the focusing ring of a manual focus lens, or an autofocus lens functioning as a manual focus, I expect only the ring to move. With the Fotodiox there is excessive play (> 5 deg) between the lens and the adapter. When you turn the focusing ring with a Nikon AUTOfocus lens mounted, the lens will move first with respect to the adapter before the focusing ring does. I don't know about others but to me this is unacceptable. When I turn the focusing ring I expect only the ring to move. With AI-S (manual focus) lenses, the play is a little less (about 2 degrees), but in both cases there is not just rotational play between the lens and adapter which is hugely annoying but will probably not affect the final image, even worse, there is also a tiny bit of play in the angle the optical axis makes with the image plane. This *does* affect image quality as I have verified. Think 'view camera' where the plane of focus is not parallel to the image plane (sensor). At first I couldn't explain the loss of sharpness even with a stellar Nikon lens like the 17-35/2.8 on my 5d, but after some trial and error I pinned it down to misalignment between the focal plane and the sensor. This is simply not acceptable on any lens adapter regardless of cost.Now that we know what the flaw is, what to do? Well, it turns out are two generic Nikon/EOS adapter designs out there. Most importers (Fotodiox included) order these from China and put their own logo on it. I have an adapter *identical* to the Fotodiox that I got from eBay(tons of those out there) except it doesn't have the Fotodiox name. You can tell this design from the presence of a little black spring loaded lever that you press to unattach the lens from the adapter. This is the flawed design and the one to avoid.The other (costs about the same) has a little square tab with a hole in the middle which you push/pull to mount/ unmount the lens from the adapter. I own one of these as well. There is almost zero play with the lens mounted on this. It fits tightly and is a pleasure to focus with. This is the one to get. These are also plentifully available on eBay.Needless to say, my Fotodiox is going back to Amazon.