ABOUT DSLR CAMERAS
In the most literal sense, a DSLR camera is a digital single-lens reflex camera. Inside the camera body is a mirror that reflects the light coming from the lens up into an optical viewfinder, by way of either a prism (in higher-end DSLRs) or a series of additional mirrors (usually in lower-end models). This is how you can see what you’re shooting, right through the lens, and is where the term “reflex” comes from — referring to mirror’s reflection.
When the shutter is pressed, that mirror flips up out of the way, the shutter slides open, and light coming from the lens takes a straight shot to the imaging sensor where a photograph is made.
The advantage of this design, compared to that of a mirrorless or point-and-shoot camera, is that you can see, in real-time, the exact scene you’re going to capture via the optical viewfinder. There’s no lag, as there can be with point-and-shoots and mirrorless cameras as the sensor has to transfer what it is seeing to a separate digital display elsewhere on the camera. On the downside, you can’t preview your exposure settings through the optical viewfinder the way you can on a mirrorless camera. (If you haven’t gathered by now, mirrorless cameras are so named because they don’t have a DSLR’s reflexing mirror.)
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