Okay, the discontinued FD zoom lenses have maximum apertures of f/4.0 as opposed to the variable aperture of f/4.5-5.6 for the EF 80-200mm lens, hence the reason why it can be made much more compact. Basically, you lose half a stop at the 80mm range and one-stop at the 200mm setting. But the EF zoom lens is far lighter than the two FD versions, making handheld shooting much easier despite the smaller maximum aperture. And, the EF lens features a 52mm filter size compared to the 58mm used by the two FD lenses. The lens has a 52mm diameter thread The plastic lens mount of the lens Familiarising myself with the EF 80-200mm f/4.5-.6 II zoom lens on my Canon EOS-1N took some time getting used to initially. First, the lightweight feeling. This lens is even lighter than my standard EF 50mm f/1.4 USM and most of the time, I felt as though no lens was fitted to the EOS-1N whenever I lug the whole package over my shoulder. Second, like the EF 28-80mm f/3.5-5.6 V USM zoom, the center AF point of the Canon EOS-1N has difficulty in focusing the lens, causing it to hunt aimlessly when I was using it to shoot low light subjects, such as inside the MINES' shopping mall. Switching over to the EOS-1N's 5 AF-point took care of the problem since the other four sensors could react to EF lenses having maximum apertures of f/5.6 or larger. Shot at 80mm setting Shot at 100mm setting Shot at 135mm setting Shot at 200mm setting << Back to Main . 1 . 2 . 3 . 4 . 5 .