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Not focusing with flash

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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Digital Rebel XT / EOS 350D Digital Camera with EF-S 18-55mm Lens: my rebel xti won't shoot a macro shot. There's pl...


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.

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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.

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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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