Originally posted by zapp .... thats why you want Pentax glass on Pentax cameras ....
"Want" is the key word. Sometimes we "need" third party glass.
The 15-30 zoom is a good lens but heavy for hiking, and needs a bulky expensive filter solution. Pentax' widest full frame prime is the FA 31 Ltd. We're "forced" to use Samyang or others.
There's no tilt-shift lens. Samyang is the only one AFAIK.
This thread started with the Sigma 70-200. Most owners bought that lens before the Pentax DFA 70-200 was available.