Calibration Question

**jrpower10** · 12-03-2014, 05:46 PM

I bought a Lens Align to check and adjust focus for my lenses. The first three I checked were all significantly back-focusing (+10, would've gone to 11 if allowed I think, +9 for second, +7 on the third). I'll check a few more this weekend, but if I continue to see a back focus issue, would this indicate a need to calibrate the camera rather than lenses? Is it possible the sensor is off a fraction from the plane it should be on, or do I need to send the really off lenses somewhere to be calibrated?

**jatrax** · 12-03-2014, 06:00 PM

You do not say which camera but from what I have read a camera that has back/front focus issues with multiple lenses that are close to the limit (+/-10) are in need of a factory calibration. Fine focus adjustment is great for small adjustments or for a lens that is off a bit. But if all are off about the same then I would send it in to Ricoh to get calibrated.

VisualDarkness · 12-03-2014, 07:02 PM

What camera are you using? For instance the K-5 got problems to focus on the correct plane under tinted light. So if you calibrate under tungsten light you might get worst focus in daylight and vv.

alamo5000 · 12-03-2014, 07:24 PM

I was also going to say that make sure you do your calibration in daylight.

**jrpower10** · 12-03-2014, 08:33 PM

Camera is K-5IIs. I'll verify calibration this weekend on the three I've done, and a few more. If they are all significantly back-focusing, I'll contact Ricoh. Thanks for the response.

Ptr_Mrtn · 12-04-2014, 06:04 AM

Back/front focus is an annoying issue

ruben · 12-09-2014, 02:50 AM

I do that with a SpyderLenscal but it's the same procedure: You have to be sure you do it with maximal aperture (lowest value) und full (highest) focal length on zoom lenses.
Then, be sure camera and pattern is on same height and that pattern (Lenscal) is parallel to your camera (sensor).

Then try again like this and tell us your results.

12-03-2014, 05:46 PM	#1
jrpower10 Site Supporter Join Date: Sep 2011 Location: Richland, Washington, USA Posts: 935	Calibration Question I bought a Lens Align to check and adjust focus for my lenses. The first three I checked were all significantly back-focusing (+10, would've gone to 11 if allowed I think, +9 for second, +7 on the third). I'll check a few more this weekend, but if I continue to see a back focus issue, would this indicate a need to calibrate the camera rather than lenses? Is it possible the sensor is off a fraction from the plane it should be on, or do I need to send the really off lenses somewhere to be calibrated?

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12-03-2014, 06:00 PM	#2
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	You do not say which camera but from what I have read a camera that has back/front focus issues with multiple lenses that are close to the limit (+/-10) are in need of a factory calibration. Fine focus adjustment is great for small adjustments or for a lens that is off a bit. But if all are off about the same then I would send it in to Ricoh to get calibrated.

12-03-2014, 07:02 PM	#3
VisualDarkness Veteran Member Join Date: Nov 2011 Location: Uppsala, Sweden Photos: Gallery Posts: 4,439	What camera are you using? For instance the K-5 got problems to focus on the correct plane under tinted light. So if you calibrate under tungsten light you might get worst focus in daylight and vv.

12-03-2014, 07:24 PM	#4
alamo5000 Pentaxian Join Date: May 2012 Posts: 2,962	I was also going to say that make sure you do your calibration in daylight.

12-03-2014, 08:33 PM	#5
jrpower10 Site Supporter Join Date: Sep 2011 Location: Richland, Washington, USA Posts: 935 Original Poster	Camera is K-5IIs. I'll verify calibration this weekend on the three I've done, and a few more. If they are all significantly back-focusing, I'll contact Ricoh. Thanks for the response.

12-04-2014, 06:04 AM	#6
Ptr_Mrtn Senior Member Join Date: Jan 2014 Posts: 143	Back/front focus is an annoying issue

12-09-2014, 02:50 AM	#7
ruben Inactive Account Join Date: May 2014 Posts: 21	I do that with a SpyderLenscal but it's the same procedure: You have to be sure you do it with maximal aperture (lowest value) und full (highest) focal length on zoom lenses. Then, be sure camera and pattern is on same height and that pattern (Lenscal) is parallel to your camera (sensor). Then try again like this and tell us your results.