Originally posted by xmeda Tokina, Kenko (TCs), Zeiss, Tamron, Sigma and now these toys.. I expect Samyang/Rokinon to ditch K mount within next year or two. Irix too.
Perhaps, perhaps not. There's still plenty of glass around
Originally posted by xmeda Where are all those people who claimed how FF body will smash the market and bring many customers? All I can see is exactly the opposite thing.
Well, judging by the number of K-1 and K-1II owners we have on these forums - and that's going to be a fraction of the overall user base, of course - Pentax FF seems to have done rather well.
Originally posted by xmeda Sigma 35/1.4 is nice piece of glass.. one is in my cabinet waiting for some K3 replacement as K5 is barely able to nail the focus during PDAF.
Although the K-5 wasn't renowned for its AF, this is far more likely to be an issue with Sigma's reverse-engineered Pentax AF protocols. I own a
lot of Pentax AF lenses, and not one of them has problems nailing focus on my K-5, K-3 and K-3II (with the exception of an old Pentax-FA 28-105mm F3.2-4.5 AL that is a little unreliable at the long end - a known issue). My Sigma 17-50 f/2.8 isn't bad, but not quite as good and not 100% reliable on the first focus attempt. My Sigma 30mm f/1.4 Art - one of my favourite lenses - is
infamous for AF difficulties on Pentax bodies when using anything other than the centre AF point. Most of the time, I use that AF point and focus / re-compose, so it hasn't been an issue for me... even on the K-5.
It might be worth trying your Sigma 35/1.4 with the next Pentax APS-C body before you buy... I'm not entirely confident it's Ricoh's issue to resolve