I have this lens. I bought it second-hand from e-Bay. It is a really difficult lens to use, but it depends on what sort of photography you do. If you want to get big close-ups of very small subjects eg insects, it will do a marvellous job, but you really have to have a ring light or similar on your camera (and maybe an off camera flash as well) as you have to get so close to the subject that the lens will cast a shadow and block any other light. You will certainly need a good tripod (it is quite a heavy lens) and any movement either in the camera or by the subject will immediately ruin the photo, as the d-o-f is miniscule. It isn't generally a lens you can take out and about (although there is someone on this site who does that, I believe). You would be better off with a Canon 100mm macro if you want to go walks in the woods with a macro. But if you have time to spare to set up the 65mm lens and the lighting, and a subject that will stay still, you can get amazing shots. I'm attaching a photo, one of the earliest I took, of a quarter-inch bluebottle. You can see that the focus falls off really quickly, even on its' head. I used a ring=flash and an off camera flash to get the light on this fly. I have not as yet mastered the lens, because it does take up a lot of time. It is a great lens, but I would say, fairly specialist. Wonderful if really big close-ups of tiny things is what you are into.