Out of 2 Ratings

Owner's of the Canon Camera Lens 2578A002 gave it a score of 4.2 out of 5. Here's how the scores stacked up:
  • Reliability

    4.0 out of 5
  • Durability

    5.0 out of 5
  • Maintenance

    4.0 out of 5
  • Performance

    5.0 out of 5
  • Ease of Use

    3.0 out of 5
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10. Extenders (Sold Separately)
With Extender EF1.4X ll or EF2X ll attached, the lens specifications will change as follows:
Item With EF1.4X ll Extender With EF2X ll Extender
Focal length (mm) 98 – 280 140 – 400
Aperture f/5.6 – 45 f/8 – 64
Diagonal 25°20’ – 8°50’ 16°20’ – 6°10’
Angle of view Vertical 13°50’ – 4°55’ 9°10’ – 3°30’
Horizontal 20°50’ – 7°20’ 13°40’ – 5°10’
Maximum magnification (×) 0.31 0.45
•Autofocusing is still enabled with Extender EF1.4X II attached.
When an Extender is attached, the AF speed will become slower by design to retain proper
AF control.
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
With Extender EF2X II attached to the lens, only manual focus is possible.However, with the EOS-
1Ds Mark III, EOS-1Ds Mark ll, EOS-1Ds, EOS-1D Mark lll, EOS-1D Mark ll N, EOS-1D Mark ll,
EOS-1D, EOS-1V/HS, EOS-3 camera, autofocusing with the center focusing point is possible.
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.