Sigma | 50-150mm f/2.8 II EX DC HSM Lens for Pentax | 691-109 Pentax | SMCP-DA* 50-135mm f/2.8 ED (IF) SDM Autofocus | 21660
I'm trying to decide which of these two lenses to get.
Dimensions are the same, price is the same.
Pentax has weather sealing, Sigma doesn't.
Sigma weighs 100g more.
Sigma has 15 more mm at the long end.
Does anyone have experience with these lenses? How does the AF speed and image quality compare?