Originally posted by Cinders Yeah, I'm wondering about if the k-x can fix things like purple fringing or chromatic aberration. Then it would just be down to sharpness vs. AF speed.
Is the tamron really painfully slow? If all I'm used to is the kit lens, will I be disappointed or not notice a huge difference?
I used to have the Tamron but sold it; UGH that purple! Some people aren't that bothered by it, but I was, and I decided I'd rather have no autofocus tele at all than deal with the purple. At some point I'll invest in a nice tele lens.
Autofocus on the Tamron -- I wouldn't call it swift, but certainly not painfully slow. It gets the job done.
The K-x won't fix chromatic aberration or purple fringing on these lenses at all -- you'll need to post-process on the computer to do that. Generally, in-camera lens correction only works on genuine Pentax DA and DFA lenses, and perhaps the FA limiteds too, but I'm not sure about that. Definitely not a third party telezoom.