Something to keep in mind is that the FD lenses need an adapter with an optical correction lens. The distance from the lens to the focal plane is different in the FD, and the adapter cannot be made shallow enough to adapt the lens straight across. The correction lens in the adapter adds another lens to the equation and the images suffers depending on how well the correction lens was made. But it does degrade a bit no matter what.
Some people are selling adapters without the correction lens. They claim you don't need one. Not true. Without the correction lens, you have a macro tube on the back of your lens. My 50 mm 1.4 will only focus out to about 3 feet with a correction lens free adapter.
At best you will have some degradation of the image, and a manual focusing lens that has to be stopped down manually also. At the worst, you will have a lens that will not focus very far out, and the adapter will not trigger the iris on the lens, so you are stuck with a wide open, short range focus arrangement. (Guess which one I wound up with, when I did not know better.) Being uniformed, I bought my 40D, because I had some lenses I liked from my Canon A-1. I passed up a good deal on a Nikon, because I already had some nice glass. Guess how happy I was after I realized what not doing my homework cost me.
In the end I like the Canon, and I am satisfied with my purchase.
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