Having problems with your Canon EOS-20D Body only Digital Camera ?
Grainy, Spot Filled Images when using Manual Modes Only
\015 I have a Canon 20D and am using a Canon 28-135 IS lens with it. The camera was bought refurbished about a year and a half ago. The lens is only a few months old. I notice that when I take pictures in the manual modes like Aperture Priority etc, my pictures turn out grainy and the dust spots are a lot more prominent. When I shoot in the automatic modes there is no graininess and the dust spots are very few. The dust spots I know can be taken care of with a cleaning, but the graininess really concerns me. I had a similar issue about a year ago and took it into a repair shop because the camera wouldn't even take pictures in the manual modes at all. They fixed the problem, but couldn't really tell me what they did. And now it appears that the problem has come back. Any idea what this could be?\015
It sounds like the aperture is getting set very high. If the aperture is a high number, the lens opening is very small which lets less light in and would cause a dark image. This would also show any dust that is in or on the lens or image sensor. The dust doesn't usually show on apertures with a larger opening (smaller number). Make sure your aperture is being set to a reasonable number, probably no higher than 8 or so.
Repair Help & Product Troubleshooting for Canon EOS-20D Body only Digital Camera
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Grainy, Spot Filled Images when using Manual Modes Only
It sounds like the aperture is getting set very high. If the aperture is a high number, the lens opening is very small which lets less light in and would cause a dark image. This would also show any dust that is in or on the lens or image sensor. ... Canon EOS-20D Body only Digital Camera
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