Question about Canon Digital Rebel / EOS-300D Digital Camera with EF-S 18-55mm Lens

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Error 99 with Canon

I have a Sigma 400mm 5.6 that registers Error 99 whenever I try to use it with my Canon 300D or my Canon 20D.  Oddly, the problem doesn't occur when I attach the lens to the 5D, but that's not the body I want to use it on.
I'm going to Costa Rica and would love to take this very lightweight lens with me, but can't it if won't work.
Please help!

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You need to have your Sigma lens rechipped. Contact your local Sigma representative, they should be aware of this, and will be able to tell where to take the lens to be rechipped.

Posted on Mar 21, 2008

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Canon D300 camera and 18-55 mm lens = when I click the camera not exposing the picture and massage display on LCD Error 99,

Posted on Mar 09, 2009

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I have the same lens and had the same issue to begin with. The problem is that the lens is fixed at 5.6, so when the camera tries to automatically change the aperture, it is unable to and this causes a crash.
If you set the camera to one of the manual aperture settings and adjust the aperture to the lowest possible whenever you change the zoom level, it works fine. It's only a slight inconvenience and once you get used to checking before taking a photo, it's no problem.

Posted on Apr 14, 2008

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