Today I went to use my Canon Ti Rebel with my 28-200mm zoom lens, however when I took a photo the shutter cliked twice and then the low battery symbol started flashing, i then turned the camera off and then back on. The battery symbol was back to full power.
Tried again and the same result.
Then changed the batteries and tried again but the same result once again.
I then tried it on my other cameras (Eos 1000FN and EOS300V) but still achieved the same fault.
Any ideas out there what it could be ??
I am assuming you have no flash attached(front or rear curtain sync is a slowed shutter motion hence x 2 clicks)it sounds like it could be a sticky shutter and it senses a fault and shuts camera down. see the warranty and get it to an authorised repair service. its not a mechanical camera so sod working on it yourself you could do more harm than good.
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Sigma makes their lenses with a variety of camera mounts. If you get the lens with a Canon mount then yes, it will fit any EOS Rebel camera body. A lens with a Pentax mount, for example, will not fit a Canon camera.
I had the same problem with the same lens. Over a few months it got lose, eventually getting so sloppy that it dropped if my 40D was held down. 10 days ago it jammed and the zoom was locked. I sent it to Canon and received it back in a week and it is now like new. Please don't try and fix it leave it to the experts at Canon. Not sure what the cost was as mine was still just under warranty
I think that this is a common problem with this lens and beleive that something in the lense works loose and eventually drops into the mechanism.
I hate to re-invent the wheel (and I don't want to cut 'n paste someone else's hard work to present as my own) so please click here for a likely practical solution which usually works and for Canon's own suggestions on the error 99 fault.
If this has assisted you then please rate my answer; if not then add a comment to provide feedback and I'll attempt to provide an alternative solution.
My lens did the same for most of the past year or so. Finally it started catching as I zoomed in and out and would not go wider than ~24mm. The problem is one or more of the screws holding the zoom mechanism comes loose and jams. Follow this link for the fix; took me ~20 min to repair (I went very slowly)!
If I read this right, your lens is a 28 to 200mm zoom lens with aperture of f:3.5 - f:5.6. What this means is that at 28mm it has a maximum aperture of f:3.5. When you zoom out to 200mm, the maximum aperture is now f:5.6. This is perfectly normal for a zoom lens of this type.
Typical situation in Shutter preferred mode. I have the shutter set at 1/125 of a second and the f:stop is f:3.5. When I zoom out to 200mm, the shutter speed is still 1/125 of a second, but the f:stop is now f:5.6 and I have decreased exposure (darkened the picture) by almost 2 full f: stops.
Realizing this, I think that "turning off the camera" really isn't a fix. The problem is realizing that the aperture will change as the focal length of the lens changes (as you ZOOM in or out on your subject). Try the aperture preferred mode and you should note that the shutter speed will change as you zoom in and out.
Most important, pay attention to shutter and f:stop info in your viewfinder. FYI : Zoom lenses that hold aperture at all ranges cost several thousand dollars, and canon makes them - they weigh a ton.