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11-06-2015, 09:07 PM   #1
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No kidding about AF in tungsten lighting

I decided to do what I thought was necessary lens adjusting for my Tamron 28-75 and my Sigma 105 on the K5. I did close up shots on a focus board under the house lights and I had to adjust most of the lenses to -8.

but..

When I did it again today in sunlight it turned out that none of the lenses needed to be adjusted, well... the Tamron did, but only by -2.

So its true that the K5 has front focus problems in tungsten light. The good thing is that I can turn the adjustment on/off depending on lighting and the adjustment settings are kept for each lens. I was hoping the newest firmware would correct this but it doesn't look like it'll get fixed.

I'm glad I have the IIs as my main Pentax. I'm not badmouthing the K5 at all but I can see why they needed to make these improvements.

11-07-2015, 04:54 AM   #2
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I found setting wb to tungsten fixed af in tungsten light with the k10d. Interested to see if that 'trick' works for you.
11-07-2015, 07:08 AM   #3
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QuoteOriginally posted by calsan Quote
I found setting wb to tungsten fixed af in tungsten light with the k10d. Interested to see if that 'trick' works for you.
Tungsten setting didn't affect AF with my K-5. It still front-focussed like crazy in yellow light, even after installing the firmware upgrade that was supposed to fix the issue. I returned it after two weeks, kept my K20D and K-x.
11-07-2015, 07:17 AM   #4
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The issue you describe is why I upgraded to the K-3.

The 'cure' for the K-5 tungsten problems is any Pentax DSLR from the K-30 onwards, inc the K-5 II, K-50, KS-2, and of course the K-3, as fixing the problem required hardware changes.

11-07-2015, 11:30 AM   #5
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QuoteOriginally posted by rawr Quote
The 'cure' for the K-5 tungsten problems is any Pentax DSLR from the K-30 onwards, inc the K-5 II, K-50, KS-2, and of course the K-3, as fixing the problem required hardware changes.
IME, the K-5 performed significantly worse than the older cameras in tungsten light, as shown in this test:
https://plus.google.com/u/0/photos/100586096103361553535/albums/560324553454...CLf74sWxotSUfA
11-07-2015, 02:11 PM   #6
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QuoteOriginally posted by audiobomber Quote
IME, the K-5 performed significantly worse than the older cameras in tungsten light
Now that you mention it, I never noticed the problem on my K200D or K-x either, at least not to the same extent I sometimes experienced it with the K-5.
11-07-2015, 03:09 PM   #7
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I remember reading about the problems when I had a K-x, but I don't remember being effected by it...at least not that I noticed.
11-07-2015, 08:15 PM   #8
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QuoteOriginally posted by Edgar_in_Indy Quote
I remember reading about the problems when I had a K-x, but I don't remember being effected by it...at least not that I noticed.
The K-x never had the tungsten AF problem. Only the K-5 and K-r had it. Earlier cameras didn't, later cameras didn't.

11-16-2015, 07:21 PM   #9
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My K-5 has never given me any trouble in tungsten light.
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