Camera Q.!!!?
How long can you film the things with Polaroid i639M 6-Megapixel Digital Camera (Magenta)?
ALberto, the reason you can't watch the live scene on the LCD like you can on a point-and-shoot camera has to do with how they are designed. The CCD chip in a point-and-shoot camera sits behind the lens, and thus can be turned on to send the signal to the LCD view screen. In fact, the chips used in P&S cameras were originally made for digital movie cameras - that's why there is a slight pause between the time you press the shutter button and the time the camera snaps the shot.
An SLR design is fundamentally different. When light enters the lens, it is reflected off a mirror and through a reflecting prism to get to the eyepiece you look through. What you are seeing is the exact stream of light that is coming through the lens (thus the name single lens reflex - the light coming through the lens is reflected up to your eye). In other words, the CCD chip doesn't "see" any light until you press the shutter button, at which time the mirror flips up and out of the way and the shutter opens, exposing the chip.
Since the chips used in DSLRs are specifically designed for still shooting, there is no perceptable delay between pressing the shutter and getting the shot.
So it's not that using the LCD is "not a professional thing" - it's a technically impossible thing. On the other hand, LCDs have crude resolution compared to mirrors, so the level of detail you can spot in the SLR viewfinder is far greater than any LCD could show you. To check depth of field, for example, is a waste of time on an LCD - you can't tell anyway.
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