Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Will this fit a cannon rebel xs?
Document: It wont be 100 percent perfect ( Id say it will be 92 percent sharp ) but it will get you closer then any lens you can buy for under 2,000.00.You will need a tripod, and you will need to practice with the manual focus ring. Don't give up on it just because its tough to use.I still have a non L cannon 75-300 mm and this lens is capable of greater sharpness at 1,300mm then the cannon lens can muster at 300.
This lens really is as powerful as it claims and I've taken some great shots with it. The build quality is better than I expected for this price. The focus is manual which is fine if you take your time. Sadly, the lens has dirt inside it which is from the factory. I don't think I can fix that but I can fit it digitally. Great value though I won't use it for my professional work but it's a great lens to play with.
the Opteka 650-2600 HD Telephoto Zoom lens is broken already  camera will not lock just spinscan not get it to lock downused only a few timeshad problems with it from the start
image quality of this lens is nothing to brag about. The zoom is extraordinary. dont expect to take super crisp professional quality with this lens. This lens is built so you can get pictures when you never could have without it. I could fill the entire frame and more of the moon with this lens w/o the 2x converter. much better image than what you'll get with a 300mm or 400mm because with those, you'd have to crop like crazy. This lens is even better when use for video.
iT WAS HARD TO FOCUS AND EVEN WITH TRI-POD, IT STILL WOULD NOT STOP MOVING. kELP GOING UP AND DOWN. I RETURNED IT WITH IN THE 15 DAY RETURN POLICY AND STILL WAITING FOR CREDIT.
i just purchased this lens from 47th avenue seller. they shipped it fast and today i tried it. i have canon 300D. obviously you will need a tripod. there is no way you can shoot a still picture holding 5 pounds in your hands and w/manual focus. it works pretty well at 650mm. to reduce shakeness you might want to use a shutter remote(6$ on ebay).
i cannot talk much about the quality b/c i just had it for a very little time. it look alright. and please ignore those stupid reviews on different web sites of people who comment about this lens without trying it!
but it is great for the lanscapes. i did some great pics using 200 ISO. a lot of people write bad reviews before they even try this lens. all we knoe that canon or sigma lens 700mm would run around 7000$ or more and obviously you cannot compare opteka with those 30 times more expensive lenses. but some people do and come up with the most rediculous conclusions. this lens needs time to get good pics. at 650-800mm it is perfect. you might even do some animal shots.
basically a waste of money i think? invest is a better autofocus lens and enjoy your camera then ... this is not the lens ... sorry ... weigh too heavy and weigh too long ... even on a tripod does't work sorry ... would return it if i could thumbs down ... --brent
as i mentioned earlier it is big. focusing is easy, if you ever used a telescope it is the same idea. it is hard to focus at 1300mm or more. it might look ok but when you zoom in to the pic it looks a little blury. for 250$ it is a great toy. anyone who wants to buy it needs to understand that this lens for a very specific pics. the object needs to be at least 30 yards away.
Answer: Hi Shelley  I know it fits on a 5 year old Canon XT, and it also fits on a year-old Canon T3i.  I suspect that it will fit on a good number of Canon cameras, since most that I have seen use the same lens mount.  Hope this helps..............Dave