Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-08-2012, 06:52 PM   #1
Veteran Member
LegOverHead's Avatar

Join Date: Sep 2011
Location: California
Photos: Gallery | Albums
Posts: 369
Pentax K100DS w/ Tamron 28-75 f2.8

Does anyone have this combination?

The auto-focusing on the lens is like not accurate. I point somewhere and it just keeps twitching and sometimes most of my images are blurry, instead of sharp.

01-08-2012, 08:39 PM   #2
Veteran Member




Join Date: Mar 2011
Location: Eastern Kentucky
Posts: 416
What light source,low light or ay light?Center focus or splatter focus?
Jake
01-08-2012, 11:24 PM   #3
Veteran Member
LegOverHead's Avatar

Join Date: Sep 2011
Location: California
Photos: Gallery | Albums
Posts: 369
Original Poster
Mainly low light and sometimes a lot of light, on splatter focus.
01-09-2012, 11:41 AM   #4
Veteran Member




Join Date: Mar 2011
Location: Eastern Kentucky
Posts: 416
Try it in good light with center focus,it should act better,if not there is a problem someplace.
Jake

01-10-2012, 05:39 AM   #5
Pentaxian




Join Date: Nov 2008
Location: Bangalore
Photos: Gallery
Posts: 2,450
Not sure this is the case but Tamron 28-75mm is known to have QC issues, some copies have BF/FF issues. I got my copy right second time.
01-10-2012, 10:06 AM   #6
Loyal Site Supporter
pacerr's Avatar

Join Date: Jan 2008
Location: Henry, TN
Photos: Gallery | Albums
Posts: 2,910
Every lens/body combination has potential issues. Whether those are the result of "known QC" issues is subject to many other factors.

I have had absolutely NO issues with the Tamron SP AF 28-75/2.8 on an *istDS / (2) K100D / K100DS / and (4) K200D bodies.

OTOH, certain of these lens/body pairings, especially those with after market split-screen VF accessories, did require adjustment for precise manual or auto focusing -- however, this was also true for all other lens/body combinations I've used.

H2
01-10-2012, 09:25 PM   #7
Veteran Member
LegOverHead's Avatar

Join Date: Sep 2011
Location: California
Photos: Gallery | Albums
Posts: 369
Original Poster
I'm just guessing that the lens I got has QC issues...

Using the A-Ring focuses a lot better and more accurate.

Last edited by LegOverHead; 01-10-2012 at 09:48 PM.
01-10-2012, 10:37 PM   #8
Loyal Site Supporter
pacerr's Avatar

Join Date: Jan 2008
Location: Henry, TN
Photos: Gallery | Albums
Posts: 2,910
QuoteOriginally posted by LegOverHead:
I'm just guessing that the lens I got has QC issues...

Using the A-Ring focuses a lot better and more accurate.
Ah, the old "not-using-the-A-ring" fault. Undoubtedly a lens quality control issue for sure.

H2

01-11-2012, 03:40 PM   #9
Veteran Member
LegOverHead's Avatar

Join Date: Sep 2011
Location: California
Photos: Gallery | Albums
Posts: 369
Original Poster
QuoteOriginally posted by pacerr Quote
Ah, the old "not-using-the-A-ring" fault. Undoubtedly a lens quality control issue for sure.

H2
I really never knew that the A-ring would effect the image quality...
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, dslr, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K100DS, RAW or JPEG? LegOverHead Troubleshooting and Beginner Help 11 01-09-2012 11:59 AM
Pentax K100DS Wireless Remote LegOverHead Troubleshooting and Beginner Help 2 11-25-2011 05:51 PM
Pentax K100DS Lenses? LegOverHead Troubleshooting and Beginner Help 9 10-05-2011 10:24 AM
From K100DS to K10D: Go for it? minahasa Pentax DSLR Discussion 19 05-31-2011 03:40 AM
K20D and K100DS Jakes Pentax DSLR Discussion 2 12-02-2010 12:39 PM



All times are GMT -7. The time now is 01:01 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