Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
01-26-2011, 03:16 PM   #1
Veteran Member

Join Date: Jan 2009
Location: London
Posts: 570
Which Pentax zooms are reliable?

I recently bought a 17-70 DA and there were a couple of faults with it: out of focus at F4, and the focus sometimes failed to move at all if I had previously manually set it at the shortest distance.

I read lots of stories here and elsewhere about the SDM focus motor being unreliable.

Currently I use a 16-45 DA which I've had for 4 years and I think I am sticking with it...

Is there a lens as reliable as the 16-45 but with more range, but no worse quality?

The camera is a K5.

01-26-2011, 04:06 PM   #2
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 16,192
The 18-135 has a different focusing motor. You could keep the 16-45 which is pretty good, and get a 55-300 to complement it.
01-26-2011, 05:10 PM   #3
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
how about getting a Tamron 28-75/2.8 ?
01-26-2011, 05:40 PM   #4
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,754
QuoteOriginally posted by peterh337 Quote
Is there a lens as reliable as the 16-45 but with more range, but no worse quality?
A very broad question...

The DA18-250 mm has more range and it is highy reliable, sturdy and solid. It is all depends upon what you want and what you intend to use for.

If you shoot outdoor, the DA18-250mm is your best all-around lens option. (The Tamron 18-250mm is an as good option since the 2 lenses are both manufactured by Tamron....) Like any zoom lenses, it has some shortcomings since the lens is a compromise across the focal range. But the DA18-250mm is used by many Pentaxians incl. professionals.

01-26-2011, 06:06 PM   #5
Veteran Member

Join Date: Mar 2009
Location: Chicago suburbs
Photos: Albums
Posts: 848
I agree with hcc.
01-27-2011, 07:07 AM   #6
Veteran Member

Join Date: Jan 2009
Location: London
Posts: 570
Original Poster
How reliable is the 18-135?

I carry just one lens.

Also I haven't found any reviews of the 18-135 showing distortion data. The 16-45 is about 2.5% on average and is OK. Historically zooms tended to be terrible but they are better now, I think.

Could anybody offer a view on the image quality comparison between the 18-135, and the 16-45, when used at say 25mm?
01-28-2011, 01:01 PM   #7
Veteran Member

Join Date: Jun 2007
Location: Owego, NY
Posts: 976
QuoteOriginally posted by peterh337 Quote
How reliable is the 18-135?
It has only been out for a few months - too early to have any meaningful data.
01-28-2011, 01:18 PM   #8
Veteran Member

Join Date: Feb 2010
Photos: Gallery | Albums
Posts: 971
i don't think anything is absolutely 100% reliable. For me, the 55-300 was the only zoom i've had that constantly give me predictably good results.


  • 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!
da, focus, k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Best (Most Reliable) SD Card Henry Scott Pentax Camera and Field Accessories 16 06-21-2017 03:49 PM
What do you think about these triggers? Reliable? crossover37 Pentax Camera and Field Accessories 2 09-26-2010 03:58 PM
Is ABESOFMAINE a reliable place to buy PENTAX? shang Troubleshooting and Beginner Help 15 08-04-2010 05:35 AM
Is SDM getting more reliable? bfo Pentax SLR Lens Discussion 90 03-18-2010 01:02 PM
reliable Photokina Pentax rumor miriya Pentax News and Rumors 209 09-19-2008 03:39 AM

All times are GMT -7. The time now is 02:42 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]