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Could be, because most camera's only can auto focus till f/1:5.6. And if 5.6 is reached at the focal length of 200 mm, the camera stops it from going to a part it can't be focused.
Perhaps you try the lens in manual focus, and manual zoom.
To be sure you can use the lens, buy a Canon EOS lens. The plastic ones, can be cheap. I bought my last lens 28 - 80 mm, couple of months ago, for 5 dollar. and a working EOS 500 was connected for the same price. (lens and camera are still in good working order) Don't try other brands, because even when you find a convertor, it could be the lens will only work on manual focus.
You have not supplied enough information, however with the Sigma lenses here are a few things that could be a problem.
Is the switch from auto to manual focus set to auto focus.
Is the lens the proper mount for the camera it is installed on (meaning have you used an adapter to go from a Nikon to a Canon mount?) if so then there will be no electronic communication and the lens will only function in manual focus mode.
Is the lens compatible with the camera model? (meaning some newer cameras set the lens aperture in the camera while some older lenses set the aperture on the lens.)
Part 1 of 2 Have you installed an older "film" lens on a newer version digital camera?
Part 2 of 2 Have you installed a digital full frame lens on a Canon "S" mount with the APS size sensor with the 1.6 focal factor?
Have you changed the camera model to a newer Canon EOS
Have you updated the camera firmware recently?
Have you lightly polished (cleaned) the contacts between the camera and lens? Have you received an error code 99? Cleaning the gold contacts on the lens and camera body can be done with a clean pencil eraser and lightly polish the matting surfaces making sure no dust gets into the back of the lens or the camera body. Hold the camera lens mount down while lightly polishing the contacts same with the lens. Do not wipe clean with a facial tissue or use any type of liquid cleaner.
Also third party lenses like Sigma often do not have the compatible electronic "chip" to properly communicate with all Canon EOS cameras. Meaning if you had the lens on a Canon EOS 20D and then put it on a Canon 50D chances are it won't work.
Is the lens properly locked onto the camera body dismount and remount the lens generally solves this problem.
If non of the above isn't the problem then a trip to a repair center is needed.
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 doubt if there is anything you can do yourself. The manual focus may have debris under the ring or is in need of parts. I would leave this one to a tech.
(From Sigma lens literature) Capable of macro photography, this
lens has a 1:2 maximum close-up magnification at the 300 mm focal
length. It's the ideal high performance lens for portraits, sports
photography, nature photography, and other types of photography that
frequently use the telephoto range. It also has a switch for changeover
to macro photography at focal lengths between 200mm and 300mm with a
maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing
distance is 1.5m / 59 in. at all zoom settings.
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
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