Can regular SLR lens be used on Digital SLR cameras?

Sure, if they have the same mount as your DSLR (you can't use a Nikon lens for your Canon etc.) However, there is a magnification factor resulting from the smaller size of your CCD (unless you have a full frame DSLR), which is mostly around 1,6x, i.e. a normal 50mm lens behaves like a 80mm one on digital bodies. It sucks if you want to use wide-angle....:)

A lot of tests prove that the quality of "normal" lenses used on DSLRs is worse than on 35mm bodies. For best results, you should use lenses designed especially for DSLRs.

The answer is yes, but depend on model...therefore before you purchase your Digital SLR, you may need to make sure your regular lens are compatible with it...OR mostly same brand of camera lens that SLR-DSLR are useable as the biggest diffirent may mostly the camera body that use diffirent technology.

Canon EF mount lenses which were used on the EOS film SLR's starting in the late '80s can generally be used on the current line of Canon digital SLR's.

Pentax, Minolta and Nikon also offer compatibility with lenses that were meant for their film SLR cameras.

Typically, yes. As some have pointed out, there is a crop factor (limited field of view) that can apply depending on the model of Dslr (1.5x for Nikons, 1.6x for some canons, 1x for other Canons).

Each camera model will have a chart that shows what which lenses work best with that camera. For example, in the Nikon world, certain old lens will not do metereing on a D70 although they might on the D2X.

See http://support.nikontech.com/cgi-bin/nik... for more info.

Finally, I very much disagree that a digital lens will work better than a film lens. I would stack my 70-200 VR (not a "digital" lens) against any "digital" lens). Sidenote: All lens are, by definition, analog. In theory, a "digital" lens could be built that is lighter and smaller than a non-digital (this is because of the crop factor). And most modern lens with good coatings, ED glass and the like, tend to handle any of the other issues such as chromatic aberation.

If you have some good quality glass, I would definitely take the time to see what is most usable.

Also worth mentioning is that when attaching an old film lens to a digital SLR, sometimes you will lose on the camera's ability to expose the picture. Older lenses have an aperture ring that coupled mechanically with a camera's light meter, and newer lenses do it electonrically.

So, depending on the lenses and camera body, you might attach an old lens only to find out you can only shoot in manual and you have no idea if you're exposing the image properly, you either just keep trying until you get it right or use your own light meter to determine proper exposure.