Sigma and Tamron are both fine companies. In some cases, WAY better than Pentax. IMO, the only thing Pentax offers in its line that are more compelling than Tamron or Sigma counterparts are WR on some lenses. If Sigma and/or Tamron sealed their lenses, Pentax would be blown out of the water for most of their line.
This makes me think there's almost an agreement for no-WR in the aftermarket.
Also, Tokina made some good stuff for Pentax. Wish some of it was still available.
I really wish Sigma made the new 35 1.4 WR, but it appears that I have to move to Nikon to get a fast 35 that's WR (on APS-c), but they also have FF 50s.
Last edited by snake; 03-04-2013 at 03:19 AM.