Problems getting Quantaray AF 70-300mm lens to work with Canon xt

Yes.

Quantaray makes their lenses with a variety of mounts. If the lens has a Canon mount then it will work with a Canon Rebel T2i. If it has a Nikon mount then it will not.

Hard to say without more info.

Is the lens just bought new? If not, it likely is 'chipped' for the Canon AF film cameras. I do not recall if Quantaray rechips their lenses. I believe Sigma does theirs, but not sure about Q~. If you got the paperwork with the lens, contact a repair center or Quantaray.
Contact US1 Photo at 877-300-8070. they are a Quantaray dealer. Ask for the number to the distributor, warranty repair facility and for the number of the quantaray home office. One of them should help you get the right lens.

lightspiritphotography.com

I bet they are not AF lenses. There are adapters that add the AF contacts to "fool" the camera but increase the zoom. You can get used lenses from many "on line" camera stores with warranties for a few months.

If it doesn't work then sorry that is how it is. I heard is not really a good reason, I hear a lot of things most is not true.

Canon EOS Digital Rebel XT or XTi are both really really great cameras.

If it's an older lens, for EOS film cameras, Quantaray might upgrade it free - contact your local Ritz Camera store ( it's imported by Ritz ) or find a repair center for Quantaray online.

You need to by one with a Canon EF fitting.

I have the same problem. So far I've contacted Sigma (I believe this is the company that manufacturers the Quantaray lens for Ritz) and they requested I send them a photo of the lens. I just googled sigma lens to find sigma support. I will update you all with any response I may get.

Some of the early Quantaray lenses, designed for the EOS film cameras, need to be upgraded by Quantaray. Contact your local Ritz Camera, or go to their support page online to find out if an upgrade chip is available for your particular lens, so it can be used with a digital EOS