Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Does it work with the canon 40D?
Document: Doesn't even work on my Canon 7D, so don't even bother. Complete waste of money, and doesn't make autofocus possible.
Not working on newer canon camera and low in quality. The af confirm chip doesn't work on t4i canon 6d and 5d mark iii. The adapter is super tight on the camera and could break the mount. The finishing is also very bad.
I tried a couple of Nikon lenses on my Canon 5d Mark II, and lenses work fine on the camera. It takes a little of skill to remove the adapter from the camera, but once you know how to do it it is no problem. The construction of the adapter could be a little bit more robust; the metal  ring seems to me a little too thin, but it is no problem, what matters is that it works.
I bought this for Canon T4i/ 650D but AF confirm chip does not work on mine.I wiggled it around the lens mount to get better contact but still didn't work, when the contact is made with the camera doesn't recognize the lens.I'm going to use it as regular adapter (non AF) because it maybe too much hassle to return and replaced, just twist the lens a bit so the AF contact is not making the contact with the camera, .
I like this product and it seems to work well. I haven't done any scientific test on whether infinity focus is perfect, but I haven't noticed anything weird through regular use. Given that this product works well, the real reason it's great is not itself but Nikon lenses. I find that Nikon manual lenses are some of the best bang for your buck lenses in all photography. In someways I even prefer them to canon L lenses.
Should be just an adapter alone. Very disappointed the af confirmation chip doesn't work! It is basically on for show. It does not even securely attach to the lens, Lots of jittering around
Works great with an old Nikon 50mm lens from 1975. Focus confirm works, camera metering works great, exif fixed at 1.4 though. Absolutely no play. Didn't come with instructions, took about 8 minutes to figure it out. You do not need to remove any screws on the old lens or camera or adapter to make this work. I Would purchase another in a heart beat.
Works well on canon 500D and canon 5D2But, cannot be mounted on canon 5DVery disappointed that it cannot be used on 5D3....
I had only one adapter at first and would switch the adapter to many different lenses, which worked but its been much more convenient to just buy one for each lens and leave them on. Then get yourself some canon back caps and you're good to go.
This product does what it says it does. There are obviously limitations to using this type of adapter, but this adapter does not provide any additional issues I have managed to identify. I bought it to use some old nikon mount lenses I found on my new Canon T3, and it works well.
Answer: Yes, the adaptor will mount a Nikon lens to any Canon EOS digital camera, including the 40D.