CANON REBEL T3i LENS

[Dreamphotos1]

I just purchased a lens for my EOS Rebel T3i. The lens I purchase was the RF 14-35mm f/4L IS USM Ultra-Wide-Angle Zoom Lens for RF Mount Canon. The lens will not fit on the camera. Did I purchase the wrong lens? 

[rs-eos]

Yes.  RF lenses can only work with RF-mount cameras and cinema cameras.

Your camera can only work with EF or EF-S lenses.  Hopefully you can return the item (though it is opened, so not sure on the return policy from where you bought it).

[Waddizzle]

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@rs-eos wrote:

Yes.  RF lenses can only work with RF-mount cameras and cinema cameras.

Your camera can only work with EF or EF-S lenses.  Hopefully you can return the item (though it is opened, so not sure on the return policy from where you bought it).

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Hopefully, you have enough to upgrade your camera to an RP.

[Tronhard]

Definitely you want another lens.  Since you have a crop-sensor camera the best lenses would be: an EF-S type, which are specifically designed for this sensor- I have all of these and they are all great lenses.

Canon EF-S 17-55 f/2.8 IS USM - a very good lens  - this is arguably Canon's best APS-C lens.
Canon EF-S 15-85mm f/3.5-5.6 slightly wider aperture, and a really good lens - I have two of them!
Canon EF-S 10-22mm f/3.5-4.5 gives you a range of wider angles if that is critical to you.

Definitely return the RF lens and get one of the above.

[LloydL]

The Canon EOS Rebel T3i is available bundled with the EF-S 18-135mm f/3.5-5.6 IS lens. This lens has agenerous (for a kit lens) and versatile optical zoom ratio of 7.5x with a 35mm equivalent range is about 29-216mm, because of the T3i's ~1.6x crop factor.

scoresense.com

[Tronhard]

Given the OP deliberately purchased a lens that was ultra-to-medium wide angle (14-35), the question is whether the 18-135, which is a good general-purpose unit, is really what they want.   I deliberately looked at lenses that would be more in the range for which they showed a preference.
The EF-S10-22mm, for example, has an equivalent FoV of 16-35mm, which is VERY close to the range they chose and is, I suspect, as close as possible to their intent.