Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
11-27-2016, 04:30 PM   #1
Forum Member

Join Date: Jun 2008
Location: Honolulu, HI
Photos: Albums
Posts: 57
Difficulty focusing with Tamrom 70-200mm

I just got myself got this Tamron telephoto lens. I was extremely excited to use it with the K-01. The first AF shots I took at home at objects within 20 feet were sharp, even at 200mm at F2.8. Of course, MF shots were sharp as well.

Then I tried taking a photo of objects in the distance, like a building down the road or 1/4 or 1/2 mile away. In daylight and AF mode, it's out of focus. No problem, I'll just put it in MF mode. Same results! It's sharp on the LCD screen but once I click the shutter, the image is out of focus. I even put the camera on a tripod and set it to 2-second timer to make sure it wasn't blur from shake. Same result!! Camera is obviously on release priority.

Any idea what the problem is? I didn't notice any problems w/ my 16-50mm F2.8 on the K-01. Nor does this problem exist with my K-X and the Tamron.

11-27-2016, 07:08 PM   #2
Site Supporter
Site Supporter
mikeSF's Avatar

Join Date: Jan 2009
Location: East Bay Area, CA
Photos: Gallery
Posts: 5,826
can you share the pics so we can help diagnose it for you? thanks!
11-27-2016, 07:37 PM   #3
Site Supporter
Site Supporter
kiwi_jono's Avatar

Join Date: Dec 2009
Location: Christchurch, New Zealand
Photos: Gallery | Albums
Posts: 1,146
Its very common for the Tamron 70-200 f2.8 not to work with live view (mine is one of them - but you will see plenty of others on the Tamron user reviews and from googling) but otherwise work perfectly with PD autofocus.

Problem is the K-01 only has live view autofocus, so you might be stuck there without contacting Tamron support.
12-01-2016, 08:38 AM   #4
Site Supporter
Site Supporter
Spodeworld's Avatar

Join Date: Aug 2011
Location: New Joisey
Photos: Gallery | Albums
Posts: 1,258
Is it a screw-drive lens? I've had problems with a screw drive Sigma 17-70. It focused perfectly on all my pentaxes except the K-01, where it always seemed to misfocus. When I put on the Sigma 17-70 with an internal motor on my K-01, it worked fine. I think the camera is temperamental with screw-drive lenses.

12-03-2016, 11:43 AM   #5
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 11,189
I don't have that lens, but here are my recommendations:
a) Make sure you have latest firmware update on K-01
b) Make sure the Tamron lens even allows focus to infinity. Sometimes a lens might have a problem with miscalibrated focusing mechanism, and this can prevent the lens from focusing to infinity.
c) Read reviews of this lens and look for Focus shift or other problems. Some lenses have Focus shift, which means that the focus changes when the aperture stops down. This can be a big problem, because you usually focus with aperture wide open and stop down only for the photo
d) Check the lens for decentering problems. These can become more apparent at certain zoom and focus distance
e) Post some sample photos here, so we can see what is happening

  • 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!
af, camera, f2.8, focus, k-01, k01, mf, mirrorless, mode, objects, pentax k-01, shots, tamron
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
FA 28-70 f/4 Difficulty Setting 28mm dms Pentax SLR Lens Discussion 2 01-28-2015 02:53 AM
DA* 16-50 Difficulty Focusing CptVoltarg Pentax SLR Lens Discussion 5 04-21-2012 08:37 AM
Difficulty focusing ugadog Pentax Medium Format 4 09-22-2011 09:48 PM
Difficulty in focusing with manual lens on k-x fekish Troubleshooting and Beginner Help 16 12-07-2010 06:42 AM

All times are GMT -7. The time now is 02:51 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]