There is a 75-200 and a 75-300 USM version. I bought both and am probably going to sell the 200. The USM is a higher quality version of the regular EF. I cannot focus closer than about 3.9', but at 300, it's good for me. I think that once you take into account distortions caused by the tank glass and the water, a good mid-class lens is more than adequate for the average guy. I admit, that if I wanted a strictly macro lens, (which I didn't), I would go with the EF 100 2.8. It's a nice lens, and more money.