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When choosing a lens for your Digital Rebel XT, look for EF or EF-S on the lens. Film lenses with the EF designation will work on your digital camera, but AF or older lenses will not fit. Trying to force them on may damage your camera.
When using a film lens on a digital camera, there will be a 1.6x conversion factor. This means that a 50mm lens will be closer to a 70mm lens in reality.
Your problem is a simple one: technology doesn't stand still.
Your lens was designed to work with Canon technical protocols which existed seven years ago and things have advanced somewhat since then.
With some third party lenses it's possible to send the lens to the manufacturer's service agent and pay to have it serviced and updated, but this cannot be done with your lens.
You'll have to buy a more recent lens model if you want to use it on your Rebel T1i. Older Canon lenses should mostly still work (unless Canon clearly state otherwise) as Canon will have taken their design into account on later bodies, but Canon have no interest nor any reason to make their later bodies able to use older non-Canon products.
Sorry that this is not the answer you hoped for, but I hope that you have still found it to be of some use and that you take a moment to rate my reply.
The older lenses will work with the Canon digital cameras, but they will be manual focus and you will need an adapter. The adapters are available at camera shops like B&H. I use some older lenses for macro.
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.
Hey jpmodell, Whether or not you can use your old lenses on a new DSLR body depends on how old your lenses are and what model lenses they are. Modern Canon DSLR cameras use what is called the EF mount which was introduced by Canon in 1987. Canon lenses prior to 1987 have what is called the FD mount which will not directly mount onto new digital cameras. Some companies do make an adapter to allow the user to mount an FD lens onto an EF mount camera but it would provide very limited functionality. I hope this helps! Sincerely, Allan Go Ahead. Use Us.
I have been researching this problem and found there's nothing you can do. Appararently, the quantaray, being an older lens, wasn't made to work with this latest era of cameras. Though it might work perfectly with your older camera, its technology is outdated as it relates to digital cameras and can't mesh with the latest and greatest. By the way, most of my questions were answered on the Digital Camera Resource page (www.dcresource.com)