When I use my Tamron lens (5 yrs oled) with my Canon Digital Rebel XT,(same age) along with the flash, my camera will not focus. I am able to make focused image with manual focus on the lens The exposure button freezes because of this focusing problem. I believe I have had similar problems outdoor, but I think in daylight, it is ultimately able to make an exposure. I changed out the lens on the body, and it focused and took the picture immediately. I believe the problem lies in the multi purpose zoom lens.
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There is a minimal focusing distance for all lenses. If you move closer to the subject than that distance then the camera won't focus on it. Check you lens manual for minimal focusing distance. It is 11 inches for Canon EF-S 18-55mm f/3.5-5.6 USM, for example.
I am having the same problem. I bought a Tamron zoom lens as an add on. This lens costs more than the camera and yet images are not as sharp as i would expect from such a highly touted camera. My Kodak Z740 point and shoot gives sharper prints. This is very frustrating. I bought Rebel for Dummies and still am having the same problem. Very frustrating
I own Rebel XT and Canon 50mm f1.8 MKII lens with plastic mount and noticed many pictures with missed focus, either front or back focusing. Meaning objects slight forward or below the intended subject is in focus. I've sent my body and the lens to Canon for evaluation and thet adjusted my focus sensors on the body. I still have problems and there are many threads related to focusing on this camera with 50mm f1.8 that the sensors on this camera do not do so well with fast lens and prone to missed focus.
Test your camera's focusing ability with a book or magazine where you focus on just one specific line and see if it is truly in focus when you review the picture.
This lens will work with Canon cameras. I use one on my Canon 30D. It is a fixed F8 you can not use auto or green box because there are not any contacts on the lens to talk to the camera. Its back to the basics manual adjust shutter and ISO to the get a correct exposer. DEFINITLY NOT A POINT AND SHOOT LENS.
if it is an auto focus lens that works on one eos camera, it should work on almost all of them. the only known exception is that some high end extenders will not fit the eos1dmarkII as it protrudes into the opening too far. but a good rule is that if it fits without any obstruction issues, it should work. try cleaning contacts on the lens and camera body. if that doesn't fix it, talk to Tamron. you can use it manually, but will not be as easy and you would get less predictable results.
my suggestion is to always go with lens from camera maker.
sounds like there is an issue with the tamron lens. not the camera. good luck mark