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02-27-2018, 09:15 AM   #1
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AF Fine Adjustment

I've been experimenting with my new K-70. I wasn't happy that the viewfinder auto-focus was working correctly, so I checked it out with one of those card lens focus calibration tools. I discovered that all three of my lenses were focussing significantly in-front of the target.

After a few hours trying different settings I have settled on applying a -8 adjustment for all lenses. All seems fine now.

I was just wondering...Is this a typical experience? Do other people have to do this?

Thanks, Jim

02-27-2018, 09:43 AM - 1 Like   #2
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QuoteOriginally posted by Jim93 Quote
I've been experimenting with my new K-70. I wasn't happy that the viewfinder auto-focus was working correctly, so I checked it out with one of those card lens focus calibration tools. I discovered that all three of my lenses were focussing significantly in-front of the target.

After a few hours trying different settings I have settled on applying a -8 adjustment for all lenses. All seems fine now.

I was just wondering...Is this a typical experience? Do other people have to do this?

Thanks, Jim
While I'm not sure if I'd call it typical, having to apply AF adjustments is normal, especially if a single adjustment value improves the focusing accuracy of many different lenses. Many other users have gone through the same process as you

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02-27-2018, 09:46 AM - 1 Like   #3
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QuoteOriginally posted by Jim93 Quote
I've been experimenting with my new K-70. I wasn't happy that the viewfinder auto-focus was working correctly, so I checked it out with one of those card lens focus calibration tools. I discovered that all three of my lenses were focussing significantly in-front of the target.

After a few hours trying different settings I have settled on applying a -8 adjustment for all lenses. All seems fine now.

I was just wondering...Is this a typical experience? Do other people have to do this?

Thanks, Jim
Hi Jim, yes very typical. I've done it with all my Pentax cameras and lenses. Interestingly, the lenses are similar in the adjustments needed, but the cameras differ. eg camera 1 needs lenses around +5. Camera 2 around +5. Camera three around +2. I've never seen one camera with my lenses varying by much more than around +or - 2. So it's the cameras that differ, in my experience. So your K-70 seems fine to me.

Just a note zooms vary across their range and a choice is often required to be made with the AF. I tend to choose AF setting for the fl I expect to mostly use the zoom.
02-27-2018, 11:12 AM - 1 Like   #4
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QuoteOriginally posted by Jim93 Quote
I've been experimenting with my new K-70. I wasn't happy that the viewfinder auto-focus was working correctly, so I checked it out with one of those card lens focus calibration tools. I discovered that all three of my lenses were focussing significantly in-front of the target.

After a few hours trying different settings I have settled on applying a -8 adjustment for all lenses. All seems fine now.

I was just wondering...Is this a typical experience? Do other people have to do this?

Thanks, Jim
I had to apply AF tuning for FA 50mm F1.4, Sigma 180mm macro & Tamron 28-75. I tested few months ago. I take AF tuning seriously and want the tests to be as scientific as possible; in the sense keep both target and camera in parallel planes; use MLU etc. I plan to retest again and then only apply the results to camera.

03-05-2018, 05:39 PM   #5
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I notice in the menu (K-3ii) that you can turn this off, apply all or apply one. If you use apply one, does it let you name the lens? Can you then do a second lens? I am assuming that different lenses may need different adjustments.

Mike
07-31-2018, 07:19 PM - 2 Likes   #6
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Fine Tuning auto-focus Lenses

Mike, several cameras are programmed to remember up to 20 distinct lenses when fine-tuning the focus...
11-26-2018, 11:41 AM   #7
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I have a question about AF fine adjustment: what are the values?
What does +1 mean? Is it the same as +10um in DEBUG mode?
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