Image extremely overexposed and has horizontal banding
Canon PowerShot SD800 IS suddenly started overexposing images taken in lighted areas, whether outdoors, lighted stage, or under lights in house (somewhat with close-up flash) and any detail in the image has horizontal banding. Have reset all settings; same problem. Had not changed anything when it suddenly started.
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You may have the exposure compensation settings overexposing you images. Since it compensates without affecting the image prior to shooting, you won't see it until after the image is taken. Check that and the flash exposure compensation too.
The shutter flex cable inside the lens is broken. Happens to all cameras from Canon A4xx series. At day the images will be overexposed with horizontal lines on it, but it could look better at dark / night. The FLEX has to be replaced. Canon doesn't supply new flex cables for these, but there are some cheap copies on ebay. But as these brake very often, I wouldn't suggest you investing money in this camera, because it will brake again sooner or later.
No, it's not a software problem. The problem is that the shutter
doesn't work so it can't control the amount of light taken so the
pictures are very bright with horizontal lines. There are usualy two
causes - a broken shutter cable inside the lens or the shuuter blades
are stuck - may happen if the lens get wet or something adhesive gets
in it. It's a hardware problem so I suggest you contact local Canon or
other camera service center. It is considered a hard repair so it could
get expensive. I don't think it's worth it, so I would suggest you get
In both the situations the problem is with the apperture control mechanism of the camera. 1). sometimes the flexible ribbion cable carrying signal to the lense assembly get worn out, replacing the same will resolve the problem. 2) in some cases the leaf blades of the apperture gets sticky, cleaning of the same solves the problem. 3). If you happen to drop the camera then the alignment of the motor moving the blades get disturbed.
In all the cases only a good repair man can fix the problem .
I also have the same problem and I took it to the canon service center. They told me that I have to replace the whole lens kit the problem was with the shutter not closing properly thus overexposing the pictures