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Canon EOS Rebel - all images are very dark

Hi all. I've just acquired a used Canon Rebel XT and every pic it takes is very dark. Using the built-in flash, and even the external flash doesn't seem to matter. It will only take a decent pic if the subject is less than 2 feet away, even in a well-lighted room. And it doesn't change on different settings either. I thought it may be the just the visual quality of the viewing screen, but the images look the same downloaded so it's not that. Anyone that may have an insight to this? Thanks!
Posted: 11/12/2012, 11:38:35 AM
What mode are you shooting in?
If manual > adjust settings
If Program/TV/AV check to see if your EC set to -2
If Auto, then check your lens aperature diaphram.

If all else fails, master reset in menu. (menu>settings tab 2> reset)
Canon Body, Sigma Glass, Canon Strobes, Adobe Creative Cloud
Edited: 11/12/2012, 11:57:43 AM
Maybe you also are using a low ISO setting or your flash's exposure compensation is set to a negative value. I often shoot at ISO 400 with a non-canon external flash.
Canon EOS 550D and a Mutant Calculator
Posted: 1 minute ago
The Rebel has a lot of controls, so you need to give us more info to be helpful for you.
f/4L Canon EF 70-300mm IS/USM f/4-5.6 Canon 100mm f/2.8 USM/Macro ...
Posted: 1 minute ago
I think you may have the exposure compensation set to something like -1IL.

On the LCD of the camera you have a rule that looks like :
-3 .. -2 .. -1 .. 0 .. +1 ..+2 .. +3

To have normal exposure you must have the graduation to 0 like:
-3 .. -2 .. -1 .. 0 .. +1 ..+2 .. +3

If yours look like
-3 .. -2 .. -1 .. 0 .. +1 ..+2 .. +3

It means that the camera is underexposing the photo from -1IL. So the picture is darker.

See page 103 of this manual:
Canon Manual

Does it help you?
50mm f1.8 Canon 70-200 f4 L...
Edited: 11/13/2012, 07:49:35 AM
I am mostly using the P auto setting. Have tried all ISO and flash combinations. I've reset everything to default settings. Nothing seems to change it. Yesterday, while messing with it, I actually got it to take a decent picture - at least 1/2 of a decent picture. The top half of the image looked great, and wasn't dark. The bottom half of the image was total black, as if something was in front of the lens. This leads me to believe that the shutter is actually not working right. May by time for a repair.
Thanks everyone for your help!
Posted: 11/13/2012, 09:00:45 AM
As far as the bottom half being black, my guess would be that your shutter speed is faster than 1/250th and you don't have your flash set to HSS.
Canon Body, Sigma Glass, Canon Strobes, Adobe Creative Cloud
Posted: 11/13/2012, 09:23:45 AM
And this only happens while using flash? Nospmisk is right. Maybe you don't have HSS on (or maybe are using a faster shutter speed). . . but you are on program AE so Isn't the camera supposed to automatically set shutter speed and aperture when flash is used?
Canon EOS 550D and a Mutant Calculator
Posted: 11/13/2012, 09:44:32 AM
Check to see if your exposure compensation is set to the left, read the manual and check that. If that's good, set the camera on a table, put it in manual, without the flash. Set your ISO at 100, your timer on ten seconds so nothing moves, and your aperature at say, 8. If you've read the manual, you should be able to use the wheel next to the shutter button to change the shutter speed. If you have live view, turn it on. Move the wheel left or right, you might have to move it a lot either way, until the blinkie is in the center. Take picture, move the blinkie one notch to the right, take another picture. Do that four times and check out the pictures. If nothing changes, you'll have to send the camera in for repair.
50mm macro, Tamron SP 17-50mm f2.8 Xr DiII, Tamron SP 70-300 f4-5.6 D...
Posted: 1 minute ago