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11-18-2013, 06:37 PM   #1
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Pentax K-M overexposure :-(

Hi,

Recently my Pentax K-M has an overexposure issue. Now and then, the pictures are very overexposed in manual mode (almost completely white, washed out).
All parameters seem ok (aperture, speed and iso...).

It happens once in a while, maybe every 40 pictures!

I tried with two different lens and I got the same result.

Any idea what's it's happening?

Thanks

Gaétan

11-18-2013, 06:38 PM   #2
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Please attach some samples will full EXIF intact.

Adam
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11-18-2013, 06:58 PM   #3
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QuoteOriginally posted by Adam Quote
Please attach some samples will full EXIF intact.
I uploaded an example.
Attached Images
 
11-18-2013, 08:30 PM   #4
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QuoteOriginally posted by francogf Quote
Hi,

Recently my Pentax K-M has an overexposure issue. Now and then, the pictures are very overexposed in manual mode (almost completely white, washed out).
All parameters seem ok (aperture, speed and iso...).

It happens once in a while, maybe every 40 pictures!

I tried with two different lens and I got the same result.

Any idea what's it's happening?

Thanks

Gaétan
Sticky aperture that fails to stop down every now and again ?
Obviously it wont happen when you are shooting 'wide open' as it does not have to stop down....
I had a Sigma lens do this to me, it needed a gentle bend on its aperture arm to get it 100% free

11-18-2013, 08:58 PM   #5
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Tried with two different lenses...same result?

Flash?

M mode? Stop-down metering?


Steve
11-19-2013, 03:41 AM   #6
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Well that was incredibly stupid of me, two sticky lenses appears unlikely to say the least, sorry.
The exif data from the image you posted appears to have been stripped.

Yes in M mode, the aperture is held wide open until the shutter is pressed, then the aperture is closed (stopped down) to whatever your chosen aperture setting is.
So if you had dialled in f8, the camera would be expecting f8, and if the lens stuck at f2.8 when the shutter opened, it would white out quite a bit.
But as you say ... 2 lenses, same problem.. I don't think so.
Could be the camera mechanism that operates the aperture arm maybe ? - since it is intermittent
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