EF Lenses


EF1200mm f/5.6L USM

  • Specifications
  • Block diagram
Marketed July 1993
Original Price 9,800,000 yen (w/case and hood)
Lens Construction (group) 10
Lens Construction (element) 13
No. of Diaphragm Blades 8
Minimum Aperture 32
Closest Focusing Distance (m) 14
Maximum Magnification (x) 0.09
Filter Diameter (mm) 48
Maximum Diameter x Length (mm) 228 x 836
Weight (g) 16,500

This super telephoto lens has the longest focal length of an interchangeable lens for AF SLR cameras at the time. Silent and fast AF is realized using a ring USM (Ultrasonic Motor) and rear focusing system. Extremely sharp, professional-quality images are realized through use of two large-diameter artificial crystal fluorite lens elements (3rd & 6th) that thoroughly eliminate secondary spectrum. Although the optical design is the same as FD1200mm f/5.6L (prototype), this lens is optimized for the EF system with a nonlinear focus cam for moving the focusing lens group, a focus preset function for quick focusing at a predetermined point, and power manual focusing with three focusing speeds. A one-touch revolving mechanism for quick switching between vertical and horizontal formats is possible. Extenders EF1.4X or EF2X transforms the lens into a manual focusing super-super-telephoto 1700mm f/8 or 2400mm f/11 lens.

Block diagram

Fluorite Lenses