What is an SLR camera?
SLR stands for Single Lens Reflex. In the days before digital cameras, SLR cameras were the tools of professional photographers. Basically the design is such that light entering the lens is reflected by a mirror up into the viewfinder (eye-piece), allowing the photographer to see exactly what the final picture will look like.
So a DSLR (Digital SLR) is just a computerized version of the mechanical SLR, using digital memory cards and light sensor chips instead of film. SLRs also use interchangeable lens, all with different focal lengths, allowing for closeup macro photography or long distance telephoto photography.
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