Digital single-lens reflex (SLR) cameras are the standard tool for serious photographers. With the introduction of cameras such as the Nikon D40 and the Canon Digital Rebel XTi the market for digital SLR cameras has expanded tremendously. A point-and-shoot compact digital camera can offer reasonably good image quality, but a digital SLR, which usually looks a lot like an old standard 35mm film camera and may use the same lenses, offers the following advantages:
- accurate, large, and bright optical viewfinder
- fast operation and large controls
- excellent image quality in low "available" light situations when it is necessary to use higher ISO speeds
- interchangeable lenses
With the digital SLR you have a good idea of what you're going to capture by looking through the viewfinder. When you press the shutter release the camera captures the image immediately. If you need to zoom or focus manually there are large rings that you can operate quickly by feel. If you see a beautifully-lit scene you can capture that beauty instead of using an on-camera flash to blast everything with harsh white light. If you need to make a specialized photo, you can buy or rent a specialized lens and attach it to the camera.
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