Jerry Thirsty , Nov 22, 2006; 01:38 p.m.
Pentax-FA lenses was the last pre-digital generation, designed to cover 35mm film. D-FA will also cover 35mm film, but are also updated to work better with APS-C sensors. DA lenses are not intended to be used with film, but only with APS-C sensors (although some of the mid- to tele- focal lengths have been reported to still cover film anyway, but are not really optimized for it). Some -FA lenses work just fine on digital, others don't. For example, the 24/2 has an excellent reputation as a film lens, but exhibits a lot of purple fringing on digital. The best way to find out is to ask on the forums about a particular lens.