Not what I'd hoped. Wanted to adapt a Vivitar 55mm 2.8 Macro with an FD Canon mount to a DSLR Canon EOS. Attaching the adapter was a bit glitchy but after a little patience it fit the EOS just fine. The frustration begins when you bring your photos to the computer and find that the focus quality is not what you expected. The excitement of having your Macro lens back in your lens arsenal quickly fades. Although the subject appears to be in focus through the view finder you quickly find the final photo is just out of focus. I tried readjusting the diopter on the view finder, not it, tried adjusting lens focus in front and in back of the subject, not it. Tried mirror lock-up, not it, tried setting highest quality photo and ISO to 100, not it. Adjusting the aperture to f8 helped. Knowing what the lens is capable of without the adapter, I would rate the focus quality with the adapter a 7 or 8 out of 10.It is what it is, a poor man's way to add a new (old) lens to their digital camera. The adapter works adequately but I would not recommend it if you are expecting the sharpness of your original lens.