Originally posted by biz-engineer
Same for me, I was wanting what Pentax don't have, banging my head on the wall all day long, I lost patience on the 12-28, and one day I had a genius idea (you know this Ah ah ! moment), I went to the Pentax shop and I got the DFA 15-30. Now, I don't look up the road map for the lens, I look down in my camera bag , and with the DFA15-30, you don't need to open the camera bag to know it's there, only the weight of the bag will suffice LoL.
Anyway, Nicolas, you can still get a Samy 14mm 2.8 for K3, or Samy 20mm 1.8 on K1, at that FoV, manual focus isn't difficult, you can even set the focus ring past the hyperfocal distance and keep it there.
I find that would be great if it had front threads for ring filters. If it supported filters, I'd have already bought it.. despite the size and price. Optically it looks fantastic.
The 14mm has odd distortion and is a mixed bag on sharpness and quality control. The 20mm isn't quite wide enough despite supporting filters. And I've tried 2 copies of the IRIX 15mm and both couldn't focus to infinity, even despite being on max adjustment.
The Sigma 10-20mm isn't a bad wide angle for crop.. I used that one for a few years and didn't have any complaints.
My biggest issue is I got settled into expecting what I had in crop to be available in full frame. And it's not all there. There is no 10-20 equiv with threaded filters, there is no 55-300 WR or PLM like lens (yet, on roadmap even though 300mm on ff is like 200mm on crop, at least there is a small telephoto zoom coming).. I did get the 28-105 WR and it is nice. Shares the same OEM lens hood as the crop 18-135 WR even.
However both Canon and Nikon have those lenses available to them. Both offer a 16-35 f/4 with front threads and have the small, affordable Sigma 100-400 f/5-6.3 available. Both also have a sharp 70-300mm FF lens to boot.
Pentax must have really low sales not to convince Sigma to start offering more DG lenses in K mount. There are so many holes that they could easily plug with lenses they already offer in other mounts.. it seems like it would be easy money.
That is what concerns me more than anything else with Pentax.. 3rd parties have more data than you or I have on sales figures and forecasts.. and they have all shrunk their offerings for K mount over the past few years. So they seem not convinced of K mount right now. Safer money is in F and EF mounts it seems..