Other Specifications | - Distance Scale, Water or Dust-resistance, With Extender EF1.4XII Attached (AF, Focal Length: 840 mm, IS, Maximum Aperture f/5.6 - f/45, 0.21x Maximum Magnification), With Extender EF2XII Attached (AF, Focal Length: 1200 mm, IS, Maximum Aperture f/8 - f/64, 0.3x Maximum Magnification, High-performance, Fluorite and UD Elements, Fast f/4 Max Aperture, Ring-type USM for Fast AF, 4-stop Image Stabilizer, Protective Fluorine Coating on Front and Rear Elements, Power Focus for Video, Dust and Moisture Resistant, L-series Quality, Compact Lightweight Super-telephoto
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