Using Extenders (Sold Separately) with the EF 800mm f/5.6L IS USM lens

Article ID: ART174703 | Date published: 06/07/2019 | Date last updated: 06/07/2019
 

Description

Lens specifications when using extender EF1.4x II or EF2x II are as follows.

Solution

Extenders

Lens specifications when using extender EF1.4x III or EF2x III are as follows.
 
Item With EF1.4x II Extender With EF2x II Extender
Focal length (mm) 1120 1600
Aperture f/8 - 45 f/11 - 64
Angle of View Diagonal 2° 10' 1° 30'
Vertical 1° 10' 50'
Horizontal 1° 50' 1° 20'
Maximum magnification (x‚Äč) 0.2 0.28
 
  • With Extender EF1.4X II attached to the lens, only manual focus is possible. However, with the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark III, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS-1V/HS, EOS-3 camera, autofocusing with the center focusing point is possible.
  • With Extender EF2X II attached to the lens, only manual focus is possible.
  • First attach the Extender to the lens, then attach the lens to the camera. Detach it from the camera in the reverse order. If you attach the lens to the camera first, misoperation may occur.
  • Only one Extender can be attached to the lens and camera.
  • If you use an Extender on the lens mounted on a EOS A2/A2E/5, set the exposure compensation to -1/2 stop for the EF1.4X II or -1 stop for the EF2X II.
 
  • AF is possible with extender EF1.4x II/III or EF2x II/III.
  • When an extender is attached, the AF speed will become slower by design to retain proper AF control.

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