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16. Extenders (Sold Separately)
Lens specifications when using extender EF1.4× II/III or EF2× II/III are as follows.
EF500mm f/4L IS II USM EF600mm f/4L IS II USM
EF1.4× II/III EF2× II/III EF1.4× II/III EF2× II/III
Focal length (mm) 700 1000 840 1200
Aperture f/5.6 – 45 f/8 – 64 f/5.6 – 45 f/8 – 64
Angle of view
Diagonal 3° 30’ 2° 30’ 3° 2°
Vertical 2° 1° 20’ 1° 40’ 1° 10’
Horizontal 3° 2° 2° 30’ 1° 40’
Maximum magnification (×) 0.21 0.31 0.21 0.30
Attach the extender to the lens, and then attach the lens to the camera. To remove it, reverse the order.
Errors may occur if you attach the extender to the camera first.
With Extender EF2× II/III 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 IV, EOS-1D Mark III, EOS-1D Mark II N, EOS-1D Mark
II, EOS-1D, EOS-1V/HS camera, autofocusing with the center focusing point is possible.
When shooting with EOS A2/A2E/5 fitted with either the EF500mm f/4L IS II USM or EF600mm f/4L IS II
USM, use –0.5 step exposure compensation when using extender EF1.4× II, and use –1 step exposure
when using extender EF2× II.
Extenders cannot be used more than one at a time.
Autofocusing is still enabled with extender EF1.4× II/III attached.
When an extender is attached, the AF speed will become slower to retain proper control.
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