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Anonymous
Your camera is incapable of doing that.
It is a single lens reflex camera (SLR), which means that all pre-photograph viewing, framing, composing, and manual focusing is done through the glass viewfinder, which receives the image by light coming through the lens and bouncing off a bunch of mirrors into it. Between the lens and the camera's sensor is one of these mirrors, making no light able to get to the sensor, and hence no visual information able to be shown on the screen, as with a digital camera, which has no mirrors in it.
At the last moment, when one presses the shutter button, the mirrors move out of the way and let light get to the sensor instead of the viewfinder; that's why the viewfinder goes black and your camera makes a loud noise when one presses the shutter: the mirrors are moving.
The only SLR cameras capable of showing the image on the rear screen are based on Olympus's four-thirds lens system. Cameras using this system are made by Olympus and a team-up of Panasonic and Leica. All of the older ones, I understand, are rather suck cameras, but I've read good things about Olympus's newest models.
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