Originally posted by wonderer I recently convinced my brother to get a k-x kit as an upgrade from his Fuji point and shoot. However now that he has bought the setup I am no longer sure if I made the right recommendation. I recommended the k-x to him for the best-in-class high ISO performance and "bang for the buck" as someone mentioned above. He got the two lens kit (18-55mm and 55-300mm) for a very good price.
However I don't think the k-x+18-55mm kit lens offers him significantly more over his fuji specially in indoor situations. The couple of extra stops of high-iso are offset to an extent by the slower aperture of the kit lens. Plus I was disappointed to see that light sources like lamps etc causes the kit lens to flare badly. Incidentally I have a Canon 18-55mm IS lens with me these days and comparing it to the Penatx kit lens, it had no flare at all in similar conditions and held its contrast and sharpness much better. Even the Fuji point and shoot had much less flare!
So I am convinced he needs a fast'ish prime in 30-40mm range to augment or replace his kit lens (2.8 zooms are out of price range). However I don't see any such affordable lens in Pentax lineup. And the more I look at Pentax Lineup the more I realize that with current Pentax lens prices you either have to stick with basic kit lens zooms or go all the way up to expensive exotic glass. There is not much of a middle ground.
I don't understand the people who dismiss the cheaper primes as being "cheap-platisc", low quality etc. Even the cheapest primes are optically superior and faster than the kit lenses or even the more expensive zooms. There need to be offerings between the ultra-cheap kit level stuff and the high-end limited / FA* etc lenses. The "all-or-nothing" approach to lens quality can work for companies like Leica but for general systems used by people with varying degree of fanancial means, "affordable quality" is very important
The middle ground is a zoom like the $350 Tamron 17-50/2.8, an absolutely excellent and versatile short zoom.
The DAL 55-300 is another excellent piece of glass. The optics for the price are bang on fantastic. I do not think there has ever been a long tele retaining this much value.
As for primes, yes, you've hit the sore spot. You'll see an announcement of a DAL prime in the FL you are looking for. This will be affordable with excellent optical quality. it is hard NOT to make an optically excellent lens in this FL nowadays and I expect Pentax to do right by their pedigree and customers here.