Digital cameras aimed at beginners and intermediate users typically only offer a built-in lens. Most digital SLR cameras, however, can make use of interchangeable lenses. With a digital SLR, if your first lens doesn't have the wide-angle or zoom capabilities that you want, you can purchase additional lenses that provide more zoom or better wide-angle options.
Digital SLR cameras are more expensive than the point-and-shoot models, and they're usually aimed at intermediate or advanced photographers.
Some Zoom Lens Drawbacks
Although choosing a point-and-shoot camera with a large optical zoom lens is desirable for many photographers, it sometimes presents a few minor drawbacks.
Noise. Some beginner-level, inexpensive cameras suffer from lower image quality because of noise when the lens is extended to the maximum zoom capability. Digital camera noise is a set of stray pixels that don't record correctly, usually appearing as purple edges in a photo.
Pincushioning. Maximum zoom also sometimes causes pincushioning, which is a distortion where the left and right edges of the photo appear stretched. Horizontal lines appear slightly curved toward the middle of the frame. Again, this problem usually is limited to beginner-level, inexpensive cameras with large zoom lenses.
Slower shutter response time. When using the maximum zoom magnification, the shutter response time sometimes slows, which may cause blurry photos. You also could miss a spontaneous photo because of the slower shutter response. It simply takes the digital camera longer to focus on the image at the maximum zoom setting, which explains the slower shutter response time. Such problems are magnified when shooting at maximum zoom in low light.
Requires a tripod. Using a long zoom lens can cause increased camera shake. Some digital cameras can correct this problem through image stabilization. You also can use a tripod to prevent blurry photos from camera shake.
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