I stole this from a post that Zany made
LR refers to Single Lens Reflex, or a camera that has one single lens to both view a scene and capture an image. What this means, to the casual photographer, is the picture you take will be the same as the image you view through the lens. It also means you can change the lens to take telephoto or wide angle photos. The most appealing aspect of an SLR camera is the ability to adjust the camera's settings manually, so that a seasoned photographer generally knows what the finished picture will look like before it is ever viewed.
2. What is Point-and-Shoot?
A point-and-shoot camera uses one lens to view the scene, and a separate lens to capture the desired image. This means the image captured will not be the actual image viewed by the photographer, but only a close approximation. For most casual photographers, the image is so close you won't recognize the difference. Point-and-Shoot cameras require very little manual adjustment (if any), and operate like the name describes. Focus is usually automatic.
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