Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-27-2013, 11:40 AM   #16
Site Supporter
Ahab's Avatar

Join Date: Jul 2007
Location: Oracle, Az
Photos: Gallery | Albums
Posts: 739
I started out with the Sigma 17-50 and quickly sent it back in exchange for the Tamron 17-50. The Sigma zoom seemed sloppy and did not feel right, the images it produced were not as good as from my old Pentax ver.1 18-55. The Tammy pretty much stays on my K5 and I couldn't be happier with it.

09-27-2013, 11:59 AM   #17
Veteran Member

Join Date: Sep 2012
Posts: 410
Another consideration is that the 18-135 has fast, accurate and quiet auto-focusing while the Tamron is a screw drive so it will be louder and all of my Tamron lenses hunt a lot more than my Pentax lenses. The Sigma has an HSM focusing motor so it will be quiet and fast. My experience with Sigma lenses has been that they tend to hunt a lot, especially in low light conditions.

I have not used either of the specific Tamron or Sigma lenses mentioned in this thread however.
10-02-2013, 10:47 AM   #18
Senior Member

Join Date: Dec 2011
Posts: 254
I suggest the Tamron 17-50mm it packs a big punch (outperforms the Pentax 16-50mm f2.8 on optics) Ok screw drive (but no SDM failures either), not as nice build and not WR but the optics count for a lot IMO.
I've used all the Sigma 17-70mm's from the first one to the most recent one it's a good lens, but drops from f2.8 quickly and you're down to f4 tele end. It is good and does a very decent macro for a zoom lens, most recent version isn't quite as good at the wide end though. The Sigma 17-50mm isn't bad either in lens AF motor, but the Tammie edges it out with better edge performance and wide open.
17-70mm is a nice range, but the f2.8 is the killer punch here so I think that is why I suggest the Tamron. If you might be in a low light situation the extra lens speed makes a big difference.

I like the Sigma, but not as much as the Tamron

Depends on what you want the 17-50/70mm lenses are an entirely different lens to the 18-135mm (I'm not fan of that lens) but some own both
10-02-2013, 08:09 PM   #19
seventysixersfan's Avatar

Join Date: Aug 2010
Location: Alexandria, VA
Posts: 1,709
really helpful feedback and comparison, thanks Mr. Spocko!!


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!, day, hood, k-mount, lens, pentax, pentax lens, quality, sigma, sigma or tamron, slr lens, tamron
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Why not buy a Fuji x100 or other high quality walk around vs a wide angle for DSLR? haycyn Pentax SLR Lens Discussion 11 06-01-2013 12:18 PM
Pentax, Tamron or Sigma ultra-wide lens??? Pepe Guitarra Troubleshooting and Beginner Help 23 06-30-2012 08:45 PM
All-around zoom - Sigma or Pentax? Ameiji Pentax SLR Lens Discussion 16 04-29-2012 08:42 AM
All around superzoom: Sigma v. Tamron? netarc Pentax DSLR Discussion 9 06-19-2009 09:11 PM
Tamron/Sigma walk-around lens queries bychan Pentax SLR Lens Discussion 6 05-16-2008 03:16 PM

All times are GMT -7. The time now is 03:34 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]