With this handy lens attachment you increase the focal length of a lens by a factor of 1.4x. The shortest focusing distance remains unchanged and the lens speed is reduced by only one stop. The fully automatic iris diaphragm function of the lens is maintained.
Compatible lenses and their increased focal lengths: 180 mm f/2 APO - 250 mm f/2.8 APO
280 mm f/4 APO - 400 mm f/5.6 APO280 mm f/2.8 APO - 400 mm f/4 APO
400 mm f/2.8 APO - 560 mm f/4 APO
400 mm f/4 APO - 560 mm f/5.6 APO
560 mm f/4 APO - 800 mm f/5.6 APO
560 mm f/5.6 APO - 800 mm f/8 APO
800 mm f/5.6 APO - 1100 mm f/8 APO