Fotodiox Lens Mount Adapter - T-Mount (T/T-2) Screw Mount SLR Lens to Canon EOS (EF, EF-S) Mount SLR Camera Body

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!

I've purchased several adapters from Fotodiox. All of them have been excellent. I have several of these for my Nikon lenses and I am very satisfied with the performance. Admittedly, the tolerances are tight and you'll have to use some force to click the adapter into place on your lens. I'd highly recommend that you then leave it on the lens and buy additional units for your other lenses.The advantage to doing this is simple: less wear and tear on your lens and easier lens changes. The only issue I've had with this adapter is with a third party zoom lens; the adapter causes the aperture ring to be extremely difficult to turn. The solution was to use a cheaper adapter with looser tolerances just for this lens. Now the ring turns freely, but there is a little bit of play between the lens and the adapter (not enough for light loss, but it's there).In short, these are great adapters at a value price that are best left on each lens semi-permanently. Other reviewers' experiences notwithstanding, I've never had any difficulty removing them from my lens. You just have to push down the tab on the back to disengage the pin and apply some torque to overcome the friction. I suspect some reviewers may have either neglected to push the tab down or were turning the adapter in the wrong direction.

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.

Works well; clean sharp pictures; easy to use.Shipped very quickly.Excellent service.

Thankful for products like this, in the event of an ordering mixup 👍

Permet de mettre une lentille Nikon sur une blackmagic camera, mais ne permet pas à l'électronique de communiquer avec l'appareil

Version FX 35 (Objectifs Fujinon) vers EOS, fonctionne parfaitement. Aucun problème pour le montage/démontage de l'adaptateur.

I purchased the adapter to adapt an M42 mount lens to my Canon 5D Mark IV. The lens: 50mm, f/1.4 Super Multi Coated Takumar, made by Asahi - Pentax. They were made in the mid 1970's.I have been able to use the adapter to fit this lens on my camera, but only by filing off approx 1 mm from the inside circle. I did this because the lens was seizing up, both aperture adjustment and focusing. I filed the inner diameter on advice of the camera shop where I purchased the used lens, who explained that the inner diameter of the adapter was a little too narrow to allow the main tab on the back of the lens to function. It was pinching.So I went to a hardware store, bought a cheap round metal file designed to sharpen chainsaw blades, and filed vigorously for about 10 minutes, all around the inner diameter. It wasn't pretty, but it did the job. The tab on the back of the lens now moves freely enough to allow aperture changes. And focus works fine also.I would have sent it back, but I needed to use the lens for an important project, and decided to push ahead. It was a bit of a bother, but the lens works fine now, and I'm happy to have it working.