EF135mm F2L USM Instruction Manual
Page 2
... this instruction Warning to prevent lens or camera malfunction or damage. The lens is available after the subject comes into focus in autofocus mode (ONE SHOT AF). 4. The Canon EF135mm f/2L USM, the EF200mm f/2.8L II USM, the EF300mm f/4L USM, and the EF400mm f/5.6L USM are high-performance telephoto lenses designed for EOS cameras. ¡"USM" stands for excellent imaging performance...
... this instruction Warning to prevent lens or camera malfunction or damage. The lens is available after the subject comes into focus in autofocus mode (ONE SHOT AF). 4. The Canon EF135mm f/2L USM, the EF200mm f/2.8L II USM, the EF300mm f/4L USM, and the EF400mm f/5.6L USM are high-performance telephoto lenses designed for EOS cameras. ¡"USM" stands for excellent imaging performance...