Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-15-2019, 08:18 PM   #1
Senior Member
Alnjpn's Avatar

Join Date: May 2015
Location: Osaka
Posts: 134
Does anyone have K3 focus issues?

Hi all. The Auto Focus on my K3 seems very unreliable. There are no problems with live view where it is accurate. However, when I use the viewfinder I am getting a lot of back focus. This is with ALL my lenses. I have tried cleaning the contacts and the mirror but this has not rectified he issue. I have tried fine tuning the lenses but the focus issue seems to be random. It does hit focus occasionally but more than often does not. I don't remember my K30 being so bad. Is this a K3 thing? Is it worth upgrading to the KP to solve the issue? Do other DSLR brands suffer from the same issues when using the view finder to focus? Thanks.


Last edited by Alnjpn; 02-15-2019 at 08:40 PM.
02-15-2019, 09:00 PM   #2
Moderator
Site Supporter
Loyal Site Supporter
MarkJerling's Avatar

Join Date: May 2012
Location: Wairarapa, New Zealand
Photos: Gallery | Albums
Posts: 14,573
QuoteOriginally posted by Alnjpn Quote
Hi all. The Auto Focus on my K3 seems very unreliable. There are no problems with live view where it is accurate. However, when I use the viewfinder I am getting a lot of back focus. This is with ALL my lenses. I have tried cleaning the contacts and the mirror but this has not rectified he issue. I have tried fine tuning the lenses but the focus issue seems to be random. It does hit focus occasionally but more than often does not. I don't remember my K30 being so bad. Is this a K3 thing? Is it worth upgrading to the KP to solve the issue? Do other DSLR brands suffer from the same issues when using the view finder to focus? Thanks.
I'd suggest you may want to take some test shots and post those photos with the EXIF information intact. There should be no reason you can't focus as well with your K3 as with your K30, unless the camera has a fault.
02-15-2019, 09:16 PM   #3
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 17,397
Have you cleaned the autofocus sensor under the mirror?
02-15-2019, 09:19 PM   #4
Senior Member
Alnjpn's Avatar

Join Date: May 2015
Location: Osaka
Posts: 134
Original Poster
Thanks. Unfortunately, I don't have any attachment space left on here. I have tested the camera many times with many lenses. Focus accuracy through live view is good, but very often missing focus when using the view finder. This is with the same settings. I am going to try cleaning the mirror again to see if that solves it. No I haven't tried the af sensor. How do I clean that?

02-15-2019, 09:39 PM   #5
Otis Memorial Pentaxian
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 37,920
QuoteOriginally posted by Alnjpn Quote
Unfortunately, I don't have any attachment space left on here.
Do you have Google Drive or Dropbox for simple download? Another alternative is to remote host on a photosharing site such as Flickr?


Steve
02-15-2019, 10:40 PM   #6
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 17,397
This may help: Dirty autofocus sensor - PentaxForums.com
02-15-2019, 10:54 PM   #7
Moderator
Site Supporter
Loyal Site Supporter
MarkJerling's Avatar

Join Date: May 2012
Location: Wairarapa, New Zealand
Photos: Gallery | Albums
Posts: 14,573
QuoteOriginally posted by Alnjpn Quote
Thanks. Unfortunately, I don't have any attachment space left on here.
To post photos hosted elsewhere, simply place the web address of that image between [IMG] and [/IMG] and your image will display here.
02-15-2019, 11:00 PM - 1 Like   #8
hcc
Pentaxian
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,717
You received already a lot very good advice IMHO.

Having a K-3 myself, and having done the mistake once: could it be that the diopter adjustment dial (of your K-3 optical viewfinder) needs to be checked and adjusted?

I might be completely wrong, but ...... might be worth a quick check,

02-15-2019, 11:01 PM   #9
Senior Member
Alnjpn's Avatar

Join Date: May 2015
Location: Osaka
Posts: 134
Original Poster
Thanks. I will post some pics later. I have dodgy eyes and have adjusted the viewfinder. reading around it seems as though it might just be that all the lenses need microadjustment. I will try that again too.
02-16-2019, 12:05 AM   #10
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,677
Looks like you also have plenty of album space and gallery space if needed.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

02-16-2019, 12:01 PM   #11
Loyal Site Supporter
Loyal Site Supporter
Crooski's Avatar

Join Date: Feb 2013
Location: Rozenburg , Zuid-Holland
Photos: Gallery
Posts: 2,910
Clean the autofocus sensor, under the mirror Not the mirror itself !
02-16-2019, 12:10 PM   #12
Loyal Site Supporter
Loyal Site Supporter
Madaboutpix's Avatar

Join Date: Dec 2011
Location: North Rhine-Westphalia
Posts: 926
QuoteOriginally posted by Alnjpn Quote
Is this (unreliable PD-AF) a K3 thing?

Er, from my experience it isn't. Coming from a K-7, I'd say, if anything, my K-3 is focusing faster and more decisively, particularly in low light (including situations where the K-7 wouldn't have been able to obtain focus at all). As far as focus accuracy is concerned, under good conditions, both are pretty spot-on, though they struggle, at varying degrees, with sophisticated tracking (haven't been able to test the PLM 55-300 yet, which is K-3 compatible and might offer some improvement). And although I haven't done any serious tests, in four and a half years of use, with a fair range of lenses, I've never felt a need to fine-tune my K-3 for front- or back-focus issues.

Therefore, my informal guess would be your issues are either due to sample variation or (perhaps more likely) dirt on the AF sensor.
02-26-2019, 07:50 PM   #13
Senior Member
Alnjpn's Avatar

Join Date: May 2015
Location: Osaka
Posts: 134
Original Poster
Thanks for the feedback and sorry for the delay in getting back. I have been through and micro-adjusted all my lenses. This appears to have solved the issue for now. I haven't used them all in the field yet but with the ones I have, the focus is more reliable. Here are the adjustments:

DA21 f3.2 +9
DA35 f2.4 +6
DA40 XS +5
DA50 f1.8 +4
DAL 55-300 +3

Sigma 17-50 None

Sigma 10-20 None


Interestingly the adjustments get less as the focal length gets shorter - not sure why would that be.

Thanks again
Reply

Bookmarks
  • 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!
camera, focus, focus issues, issue, issues, k3, lenses, pentax help, photography, troubleshooting, view
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K3-II focus issues enricoman Pentax K-3 27 01-23-2018 07:12 PM
Manual focus lenses with infinity focus issues - anyone else encountering them? kiwi_jono Pentax SLR Lens Discussion 8 10-18-2017 01:19 PM
Does anyone know of any issues on the Pentax D FA 24-70 f/2.8 with vignetting... sl8r180 Pentax SLR Lens Discussion 8 01-06-2017 05:21 PM
My K3 II is possessed. Does anyone else have this experience? BONSTA Pentax K-3 9 07-28-2016 12:08 PM
Anyone have a K-r with persistent front-focus issues and actually get it fixed? deadwolfbones Pentax K-r 7 02-17-2012 01:43 PM



All times are GMT -7. The time now is 02:41 AM. | See also: NikonForums.com, CanonForums.com 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top