Can be used on full frame or APS sensor cameras. I used it both on my Canon 6D and 70D. On a APS SENSOR YOU HAVE A 1.6x crop factor making the 17-40 an effective 27 - 64 mm lens

This lens can be used on a Canon 7D?

Yes. The Canon 7D supports EF mount lenses.

Does this lens work with EOS 650D?

Yes, this lens is compatible with Canon EOS cameras.

Questions & Answers: Canon EF 17-40mm f/4L USM Ultra-Wide Zoom Lens

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Canon 8806A002 EF 17-40mm f/4L USM Ultra-Wide Zoom Lens

EF Mount L-Series Lens
Aperture Range: f/4-22
Three Aspherical Elements, One Super UD
Ultrasonic Autofocus Motor
Manual Focus Override
Water and Dust Resistant
Internal Zooming and Focusing

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