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12-23-2014, 04:59 PM   #1
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K-01 Exposure problem

Hi. I just aquired a used K-01 and DA40xs from my friend. While I was testing it ouside on the field, I noticed some problem with the exposure.
Here are the sample photos. All photos were taken on ISO 100 and the apertures are 2.8, 5.6, and 8 (please check EXIF).

You can see it over-expose when the aperture is wide open at 2.8 while the sutter speed is 1/1250.
The next photo is 5.6, 1/320. The last one 8, 1/200.

Unlike the EXIF information, it seems as if the exposure changes only in response to the aperture.
Has anyone experienced the same problem, or am I missing something?

Attached Images
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PENTAX K-01  Photo 
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PENTAX K-01  Photo 
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PENTAX K-01  Photo 
12-23-2014, 05:20 PM   #2
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Aperture priority and pattern metering. Try spot metering and see if that doesn't solve your problem.
12-23-2014, 05:34 PM   #3
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QuoteOriginally posted by Docrwm Quote
Aperture priority and pattern metering. Try spot metering and see if that doesn't solve your problem.
Thanks for the advise. I did try center-weighted metering but it seems it's the same.
12-23-2014, 05:40 PM   #4
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QuoteOriginally posted by saintov Quote
Thanks for the advise. I did try center-weighted metering but it seems it's the same.
Factory reset, newest firmware, try again?

12-23-2014, 06:19 PM   #5
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QuoteOriginally posted by Docrwm Quote
Factory reset, newest firmware, try again?
Firmware is the latest 1.05
Don't know how to do factory reset. How can I do it?
12-23-2014, 06:30 PM   #6
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QuoteOriginally posted by saintov Quote
Firmware is the latest 1.05
Don't know how to do factory reset. How can I do it?
Setup menu 2 (wrench) then choose Reset. Should get rid of any changes the previous owner made to the settings.
12-23-2014, 06:38 PM   #7
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My take on this is you have a metering problem,if you meter for the whole scene it will be under exposed as in the first in this photo,if you use spot metering on the flower it will be exposed correctly but the background will be overexposed
so it will be a trade-off to adjust to your taste.
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