I'm getting a Pentax ZX-M for my daughter, who's going to take a college photography course. The camera comes with a SMCP-FA 28-80mm f/3.5-5.6 AL Lens. I suspect that she may require (or want) an additional lens. Since I shoot Canon myself, I know nothing about Pentax lenses. My question: what is a good Pentax lens for a student who is using this camera? I suspect the 3.5 won't be fast enough for some of the photos she will be expected to take. Any suggestions?