Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-16-2019, 07:56 AM   #1
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2009
Location: In the Florida swamps
Posts: 715
KP and focus adjustments

Just curious if other KP owners have the same experience with this.

I haven't had to adjust for any of my lenses. I've used the DA*50-135, HD DA 55-300, DA 50/1.8, DA 18-55, Sigma 17-70 and Tamron 75-300. All have been spot on without any adjustments.

With the K10D and K-7 every lens required adjustment.

Did I hit the AF lottery or is this the norm for a KP?

11-16-2019, 08:40 AM   #2
Site Supporter
Site Supporter
ramseybuckeye's Avatar

Join Date: Apr 2009
Location: Hampstead, NC
Photos: Gallery
Posts: 17,256
QuoteOriginally posted by simple1 Quote
Just curious if other KP owners have the same experience with this.

I haven't had to adjust for any of my lenses. I've used the DA*50-135, HD DA 55-300, DA 50/1.8, DA 18-55, Sigma 17-70 and Tamron 75-300. All have been spot on without any adjustments.

With the K10D and K-7 every lens required adjustment.

Did I hit the AF lottery or is this the norm for a KP?
I have not adjusted any either, or even felt they need it.
11-16-2019, 10:11 AM   #3
Site Supporter
Site Supporter




Join Date: Oct 2017
Location: Lancaster
Photos: Gallery
Posts: 3,813
Nope, not had to calibrate one the KP is the best
11-16-2019, 06:17 PM   #4
Senior Member




Join Date: May 2019
Posts: 147
I am astonished by your experience, all of you. I have had to fine tune AF for all of my lenses.

11-16-2019, 07:27 PM   #5
Veteran Member
bobmaxja's Avatar

Join Date: Mar 2010
Location: Laval, Quebec Canada
Posts: 2,171
None for me also
11-16-2019, 09:08 PM   #6
Site Supporter
Site Supporter
bkpix's Avatar

Join Date: Feb 2010
Location: Creswell, Oregon
Photos: Albums
Posts: 568
Haven't needed to tune either of my two KPs for a variety of lenses I use, from several Limiteds to the 16-50 and 50-135 DA* zooms, the DA* 300 and the PLM 55-300.
11-17-2019, 07:25 PM   #7
Site Supporter
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland. Espoo. Kouvola.
Photos: Gallery | Albums
Posts: 7,960
So far have not found any need to perform adjustment.

11-18-2019, 08:07 AM   #8
Pentaxian




Join Date: Aug 2007
Location: ABQ
Photos: Gallery
Posts: 826
I think the only lens I've had to adjust is my Tamron 70-200 2.8. Maybe the FA50 1.4 a hair. Those two obviously have a very thin DOF. And when I'm testing wide open on those lenses it's not super repeatable, so could be user error on my part.
11-18-2019, 01:33 PM   #9
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2009
Location: In the Florida swamps
Posts: 715
Original Poster
Wow - so far it, mostly, looks like the KP is pretty spot on. It would be interesting to see how it compares against other current (and past) Pentax bodies, beyond my samples of one that is.
Thanks for the replies.
11-18-2019, 04:16 PM   #10
Loyal Site Supporter
Loyal Site Supporter
Wingincamera's Avatar

Join Date: Oct 2012
Location: Pine Haven, Wyoming
Photos: Gallery | Albums
Posts: 1,176
Fine Tune Focus adjustment for my KP
Distance for focus adjustments (50 x focal length, converted to feet & inches) The goal is to stand close enough to be able to have a shallow*depth of field. The chart should take about 1/3-1/4 the size of the entire image.
Other charts state that The distance between the calibration tool and the camera should be approximately 25 times the focal length of the lens (e.g. 85mm x 25 = 2.1 m = 7 feet),

Method used: DOT-Tune
for focus confirmation.

DA 18-135mm F3.5 – 5.6 @18=2.9 ft, @135=22.1 ft Or 135mm @ 14 ft Adjustment= 0
DA 15mm F4.0 @ 2.46 ft Adjustment= 0
DA Macro 35mm F2.8 @ 5.7 ft Adjustment= 0
DA 50mm F1.8 @ 8.2 ft Adjustment= -3
FA Macro 50mm F2.8 @ 8.2 Ft, Adjustment= 0
DA 70mm F2.4 @ 11.5 ft Adjustment= 0
DA 20-40mm F2.8 – 4.0 @ 20=3.3 ft, @40=6.56 ft 35mm@F4.0 = Adjustment= 0 23mm@F2.8 Adjustment= 0
Tamron 70-200mm F2.8 @70=11.5 ft, @200=32.8 ft or 20 ft @ 200mm. Both 70mm & 200mm F2.8 Adjustment = -7
DA *55mm F1.4 Both 7 ft and 10 ft Adjustment= -1
DA DA*50-135 F2.8 Distance 10 & 20 Ft, Adjustment test varied between -1 and +1, settled on 0
11-19-2019, 08:05 AM   #11
Pentaxian




Join Date: Aug 2007
Location: ABQ
Photos: Gallery
Posts: 826
QuoteOriginally posted by Wingincamera Quote
Fine Tune Focus adjustment for my KP
Distance for focus adjustments (50 x focal length, converted to feet & inches) The goal is to stand close enough to be able to have a shallow*depth of field. The chart should take about 1/3-1/4 the size of the entire image.
Other charts state that The distance between the calibration tool and the camera should be approximately 25 times the focal length of the lens (e.g. 85mm x 25 = 2.1 m = 7 feet),

Method used: DOT-Tune DotTune: Autofocus fine tuning in under 5 minutes - YouTube for focus confirmation.
I'm going to give this method a try. Thanks for posting it!
11-20-2019, 08:19 AM   #12
Pentaxian
panonski's Avatar

Join Date: May 2015
Location: Zagreb
Photos: Gallery | Albums
Posts: 619
QuoteOriginally posted by Vmax911 Quote
I'm going to give this method a try. Thanks for posting it!
this seems far to complicated.


--

I invented my own FAST method to do Fine AF tuning.

___________________________________________________

First - yes - smaller apperture is better.

*Note - that many lenses have start to lose sharpnes when thy're at lowest apperture values- like 2.0 or similar.

--
Second - Find a object with small details, in your room. 1,5-3 m is ideal distance, but that depends on the lens, you can pick whatever you want.

--
Third - FIRSTLY - Use Live View to focus on the object. Take a pic.

--
Fourth - Swiitch to OVF - without moving camera ( preferable tripod, but I alys do that handheld )

and if focus doesn't move - and beeps with red dot immediatelly - you're done, or your AF Fine Tune is already in the best position.
--
DONT MOVE CAMERA DISTANCE FROM OBJECT - WHEN SWITCH FROM - OVF TO Live View. ! If you're handheld, sit on the chair and try to not move camera distance

____________________________________________________

IF your OVF, do a single "bzz" and do refocusing the picture - after you already take Pic with Live View - That means - they have different measures, and that meausres - must be the same !

----

Important

LiveView have Contrast AF focusing method, and that measure is always correct one. !

PDAF is do - through the mirror - with PDAF AF Safox module.


_________________

So,


Just do the couple of Live View shoots, from same position in your room, and retest same focusing with PDAF through OVF - changing Fine Tune values.


When Focus will be the same in both, the Red Square Confirmation focus - will be present - after Live View Focusing, in OVF mode, and camera would not hunt a new focus point!

__________________

SIMPLE , BUT EFECTIVE. Dont bother yourself with complicated methods, and charts

Last edited by panonski; 11-20-2019 at 08:26 AM.
11-20-2019, 08:32 AM   #13
Pentaxian




Join Date: Aug 2007
Location: ABQ
Photos: Gallery
Posts: 826
I did try the DOT method, but I seemed to get focus confirmation on almost anything (+4 to -10).

I think I'll stick to the good old review the photo method.
11-20-2019, 08:41 AM   #14
Pentaxian
panonski's Avatar

Join Date: May 2015
Location: Zagreb
Photos: Gallery | Albums
Posts: 619
QuoteOriginally posted by Vmax911 Quote
I did try the DOT method, but I seemed to get focus confirmation on almost anything (+4 to -10).

I think I'll stick to the good old review the photo method.
hmmm...
strange.


I have done - AF fine tune with this method on my 4 lenses, and every time is like I described.


If Focus in OVF do a single litle refocus - after Live View focusing, within same distance offcourse - that means you re not hit the sharpest point yet.

____________________

Work for me everytime .
11-20-2019, 04:30 PM - 1 Like   #15
Pentaxian




Join Date: Aug 2007
Location: ABQ
Photos: Gallery
Posts: 826
QuoteOriginally posted by panonski Quote
hmmm...
strange.


I have done - AF fine tune with this method on my 4 lenses, and every time is like I described.


If Focus in OVF do a single litle refocus - after Live View focusing, within same distance offcourse - that means you re not hit the sharpest point yet.

____________________

Work for me everytime .
I was referring to the method WinginCamera posted. I have not tried your method (yet).
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!
adjustments, da, kp, kp and focus, pentax kp
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
KP vs K-70 - to KP or not to KP, that is the question OldChE Pentax DSLR Discussion 28 11-02-2019 05:29 AM
On multiple bodies do lenses need consistent focus adjustments? swanlefitte Pentax DSLR Discussion 27 10-13-2019 07:42 PM
Micro Focus Adjustments jcsnyc Pentax SLR Lens Discussion 17 12-10-2018 03:43 PM
Focus adjustments and observations. drypenn Pentax SLR Lens Discussion 15 01-06-2015 01:58 PM
Focus Adjustments on a K20 with manual lenses interested_observer Pentax SLR Lens Discussion 5 04-03-2011 03:48 PM



All times are GMT -7. The time now is 11:40 PM. | 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