CAN 35MM SLR LENSES BE USED ON DIGITAL CAMERAS?

If you take a 35 mm SLR lens and divide it's focal length by 1.6 you get the equiv dslr lens focal length. For example, if you take an 80mm lens of 35mm SLR, the equiv DSLR focal length is 50 mm.

The conversion table is at:

http://www.porters.com/LENS%20COMPATIBILE.pdf