Re: digital rebel / SLR photos are nearly all black
If the camera still "operates normally" with recorded pictures while they are all black, you try to select CMOS Cleaning to see if the shutter really opens or not.
If not, a plastic lever operates the first set of curtains had broken. This could be common for all plastic shutter except EOS 1 series which use metal.
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Slow down the shutter speed of your digital camera. Whenever you must take a photo in a low light environment decrease your shutter speed. It is virtually impossible to take a blurry digital photo with a an extremely slow shutter speed. Even if your digital camera has an automatic or semi-automatic mode, slowing down the shutter speed will still produce a better digital photo.
Wait until your digital camera is completely focused. Most digital cameras will notify you that they are focus ready by a blinking light, on screen indicator or a noise. Confirm that your digital camera has locked onto your desired target before pressing the shutter release button. Some digital cameras may have trouble focusing on subjects easily. If this happens use an auto focus mode to produce a better digital photo.
Prevent your digital camera from shaking. Shaky hands or sudden movement will definitely produce a blurry digital photo. When holding your digital camera, make sure the viewfinder is firmly pressed against your face before snapping a digital photo. If you do not have image stabilization on your digital camera, then think about investing in a tripod. This will allow you to steady your digital camera for the perfect shot.
Make sure the digital image is definitely a blurry one and not just a soft image. On many occasions soft images are mistaken for blurry ones. Soft images occur often with digital cameras. When printing these images, the softness rarely shows through. You will be able to easily edit these photos by sharpening the details for a better printing experience.
Take your time. Instead of rushing to take a digital photo, set aside enough time to shoot your image. Hurrying up will not produce an excellent digital photo. You don't need to be overwhelmingly slow when taking the photo, but try your best not to take a hasty one.
Is the shutter opening? Put it on slow shutter speed and wide aperture say 1 sec at f4 or wider and look down the lens as you take photo. At some point you should see the sensor as the aperture is nearly fully open. If not then it isn't allowing light to get to the sensor, but if that's all working ok (and I assume you've looked at the photos on a computer and checked they are on the card and the exif info is sensible and they are still completely black) then you have a faulty sensor or processor. Remove battery reinsert and go into menu and reset the camera settings. Report back so???
If the affected photos were taken using a flash then you simply had the shutter speed set too high. The fastest shutter speed you may use when using flash is 1/90th of a second; with anything faster the second shutter curtain starts to travel across the film plane before the first one has fully crossed so only part of the negative is exposed.
If they were taken without flash then your camera has a faulty shutter assembly which must be replaced. It's not a DIY job, it's not cheap, and on a consumer grade 35mm SLR like any of the Rebel/EOS triple digit models it's usually not cost effective. Especially when there are millions of them lying unused and regularly available for next to nothing on auction websites and for absolutely nothing on FreeCycle/Freegle.
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If you are getting some photos where only part of the image is visible, then I suspect that they were photos where you used a flash.
Cameras have a specified maximum shutter speed for use with a flash, this is called its 'sync speed'. This is the fastest speed that the camera will need to open the lead shutter and close the trailing shutter in order to expose the entire surface area of the image and have it evenly lit by the flash unit. If you shoot too fast of a speed, then the shutter will only be partly completed its exposure and you'll get a photo with only part of the image showing. The faster the speed past the sync speed, the less the resulting area of the image. Most cameras will have a sync speed of 1/250 or less. I think a lot of the Rebel models are 1/90 - consult your manual.
Lets see if the shutter curtains are opening properly : set to B and open the film back of the camera. Now release shutter and see if the first s. curtain has opened nicely and swiftly. Then release the second s. curtain and again see if you get proper closing of the curtain.
If the shutter curtains ( usually just one misbehaves ) is slow to close then the shutter unit needs looking at . ( btw no point pouring liquids like benzine etc. into the shutter curtain are ... will make things worse ).