Hi, I do a lot of shooting indoors of machines for work under mercury vapor lights (light levels make for settings about 1/6s, f/4.5, ISO 200) and I need a better lens than the one I have now. Here's what I have so far: Pentax K10D 18-55mm Kit lens .... and that's about it. (at least that's relevant) I try to avoid using a flash because there is a lot of stainless steel sheet metal that just reflects it back at me. That and I only have the built-in flash that does a horrible job. Many shots are hand held so something fast would be nice. Shots are both overall as well as close-up's on individual components. Clarity is important as many of these shots show fine detail that is used later for identification. I think my budget will be in the $500 neighborhood so nothing too fancy but I would like something adequate. I notice the kit lens (no surprise) takes decent pictures but leaves a lot of clarity behind...among other things. Any thoughts? Thanks!