Calibration needed?

**Astropaps** · 04-05-2017, 03:14 PM

Hi, all

I just got the KP and the 200mm DA*. I was having trouble focusing using AF compared to manual focusing. I got the calibration triangle and here are the results. I set the lens to the widest aperture and ISO to 200. I set the triangle on a table and the camera about 6' away. Using spot focus, I focused on the center square. Can you tell from this photo if the lens needs to be calibrated? Thanks.

Amy

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Adam · 04-05-2017, 03:32 PM

I think it looks fine. There might be some very slight back focus, but you'd have to repeat the test a few times to ensure that the camera was correctly aligned and focused in the right place.

35mmfilmfan · 04-05-2017, 03:39 PM

You probably know this already, but on Page 63 of the manual there are instructions on applying focus corrections for up to 20 lenses.

**Astropaps** · 04-05-2017, 04:00 PM

I will check p. 63 of the manual. Thanks.

mee · 04-05-2017, 04:11 PM

Originally posted by Adam

I think it looks fine. There might be some very slight back focus, but you'd have to repeat the test a few times to ensure that the camera was correctly aligned and focused in the right place.

Yes.. It is only slightly back focusing. Very slightly. Probably 1 tick on the AF adjustment if any at all.

**Astropaps** · 04-05-2017, 05:10 PM

Thanks. I'll make that adjustment and try again

**Astropaps** · 04-07-2017, 12:40 PM

I had mistakenly used Live View to do my first shots with the calibration triangle. When I use the OVF, there appears to be quite a bit of front focus. Anybody else agree with this?

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Bengan · 04-07-2017, 12:47 PM

Originally posted by Astropaps

I had mistakenly used Live View to do my first shots with the calibration triangle. When I use the OVF, there appears to be quite a bit of front focus. Anybody else agree with this?

Yes, you have a bit of a front focus. Easily corrected

**Astropaps** · 04-07-2017, 12:54 PM

And here it is with +1 adjustment. I think that did the trick, yes?

Bengan · 04-07-2017, 12:57 PM

Originally posted by Astropaps

And here it is with +1 adjustment. I think that did the trick, yes?

Very good

**Astropaps** · 04-07-2017, 12:58 PM

Originally posted by Bengan

Very good

Thanks for checking!

**Kerrowdown** · 04-07-2017, 03:18 PM

That last adjustment there, looks like you've nailed it to me.

**Astropaps** · 04-07-2017, 03:38 PM

Thanks. I think so. Now if the weather would just improve, I'd get out and shoot with it.

following.eric · 04-08-2017, 07:41 PM

Will the k70 hold information for non pentax lenses. I've got a sigma lens but when I look at the exif data it doesn't know which lens but they pentax ones will register?

If I do some calibration on the camera with it remember old third party lenses or only pentax lenses?

Bengan · 04-09-2017, 12:33 AM

I don't own a K-70, but as far as I know Pentax bodies will hold calibration for none Pentax lenses as long as a unique lens code can be read. The Sigma 17-50 will work.

04-05-2017, 03:32 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	I think it looks fine. There might be some very slight back focus, but you'd have to repeat the test a few times to ensure that the camera was correctly aligned and focused in the right place. 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 purchasing one of our Pentax eBooks. 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:

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04-05-2017, 03:39 PM	#3
35mmfilmfan Pentaxian Join Date: Oct 2016 Location: Norfolk, UK Posts: 4,342	You probably know this already, but on Page 63 of the manual there are instructions on applying focus corrections for up to 20 lenses.

04-05-2017, 04:00 PM	#4
Astropaps Loyal Site Supporter Join Date: Mar 2017 Posts: 121 Original Poster	I will check p. 63 of the manual. Thanks.

04-05-2017, 04:11 PM	#5
mee Veteran Member Join Date: May 2010 Posts: 7,403	Originally posted by Adam I think it looks fine. There might be some very slight back focus, but you'd have to repeat the test a few times to ensure that the camera was correctly aligned and focused in the right place. Yes.. It is only slightly back focusing. Very slightly. Probably 1 tick on the AF adjustment if any at all.

04-05-2017, 05:10 PM	#6
Astropaps Loyal Site Supporter Join Date: Mar 2017 Posts: 121 Original Poster	Thanks. I'll make that adjustment and try again

04-07-2017, 12:47 PM	#8
Bengan Pentaxian Join Date: Nov 2012 Location: Stockholm Photos: Gallery \| Albums Posts: 1,767	Originally posted by Astropaps I had mistakenly used Live View to do my first shots with the calibration triangle. When I use the OVF, there appears to be quite a bit of front focus. Anybody else agree with this? Yes, you have a bit of a front focus. Easily corrected

04-07-2017, 12:57 PM	#10
Bengan Pentaxian Join Date: Nov 2012 Location: Stockholm Photos: Gallery \| Albums Posts: 1,767	Originally posted by Astropaps And here it is with +1 adjustment. I think that did the trick, yes? Very good

04-07-2017, 12:58 PM	#11
Astropaps Loyal Site Supporter Join Date: Mar 2017 Posts: 121 Original Poster	Originally posted by Bengan Very good Thanks for checking!

04-07-2017, 03:18 PM	#12
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,867	That last adjustment there, looks like you've nailed it to me.

04-07-2017, 03:38 PM	#13
Astropaps Loyal Site Supporter Join Date: Mar 2017 Posts: 121 Original Poster	Thanks. I think so. Now if the weather would just improve, I'd get out and shoot with it.

04-08-2017, 07:41 PM	#14
following.eric Veteran Member Join Date: Dec 2016 Location: Hertford, UK Photos: Gallery Posts: 319	Will the k70 hold information for non pentax lenses. I've got a sigma lens but when I look at the exif data it doesn't know which lens but they pentax ones will register? If I do some calibration on the camera with it remember old third party lenses or only pentax lenses?

04-09-2017, 12:33 AM	#15
Bengan Pentaxian Join Date: Nov 2012 Location: Stockholm Photos: Gallery \| Albums Posts: 1,767	I don't own a K-70, but as far as I know Pentax bodies will hold calibration for none Pentax lenses as long as a unique lens code can be read. The Sigma 17-50 will work.