So far my collection of lenses has been driven by the acquisition of more capability, e.g., telephoto or speed, rather than better glass. A lot of hype is devoted to the idea that the "kit lens" that came with the camera is probably no good and should be replaced ASAP. However, when it comes to my Pentax and other K-mount cameras the idea of a "better lens" has a problem, viz., does such a "better lens" even exist? New lenses all seem to possess some degree of automation, e.g., auto-focus or auto-exposure. The attendant prices and descriptions seem to suggest that these lenses offer better automation, not better glass. Automation is something I can do without. Likewise, the fare on eBay seems to be just other glass, not better glass. Even if I find a better lens, how would I know?