Principally because of the larger sensor - squashing lots of MP onto a small sensor (what happens in a compact) leads to poor image quality, especially in low light. The same number of pixels on a larger sensor (in a DSLR) will give better quality images.
other advantages of a DSLR are;
full manual control of exposure,
much shorter shutter lag,
interchangeable lenses, (which mean they function better than a 'jack of all trades' lens),
better optical quality lenses,
ability to shoot in raw format,
presence of a hotshoe (which allows control of off camera flash)
Actually the question should be what are the 1,000 differences between a compact and a dslr.
Want some serious information about dslr cameras? Try here.
It's a seriously different design. The slr (single-lens-reflex) camera is an older design adapted to digital use. It actually allows you to look THROUGH the lens of the camera, not just at a picture on the screen. DSLRs are larger and allow the use of multiple interchangeable lenses. Some allow the use of older film-camera lenses as well.
- What will be a good SLR camera for a beginner interested in picking up photography as a hobby ?
- Does the warranty that come near Nikon DSLR cameras apply worldwide?
- Which Camera Should I Get?
- What features of DSLR Camera should i grasp?
- First digital SLR camera beside a $800 budget. What is my best choice?