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08-27-2015, 01:19 AM   #1
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Random overexposure with K-3 and HD 16-85

Hello,

I have a weird problem with my K-3 and my new HD 16-85. Some shots are horribly overexposed, but aperture, ISO and shutter speed are the same like similar shots which are correctly exposed. It seems like the lens just did not close the aperture. This has never happened to me before with another lens on my K-3. Is my copy of the 16-85 bad and should I return it or is this an other problem?

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08-27-2015, 01:39 AM   #2
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Have you tried cleaning the lens contacts on the lens and camera? Just rub with a cloth.
08-27-2015, 01:42 AM   #3
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Does the aperture lever work smoothly and correctly stop down if you operate it manually? Judging from the EXIF, the lens is reporting to the camera that it's stopped down to f/11. Is it possible to tell if the depth of field in the overexposed shot is consistent with f/11 or wide open?
08-27-2015, 02:13 AM   #4
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Thank you for your replies.

QuoteOriginally posted by calsan Quote
Have you tried cleaning the lens contacts on the lens and camera? Just rub with a cloth.
Yes, I clean the contacts regularly. They should have been clean when I took those shots.

QuoteOriginally posted by Paul the Sunman Quote
Does the aperture lever work smoothly and correctly stop down if you operate it manually? Judging from the EXIF, the lens is reporting to the camera that it's stopped down to f/11. Is it possible to tell if the depth of field in the overexposed shot is consistent with f/11 or wide open?
The aperture lever seems to be ok and stopping down works. Judging from the attached picture, the depth of field is indeed smaller on the overexposed shots.

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08-27-2015, 03:56 AM - 1 Like   #5
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Ideally, the lens should be tested on another body. However, if you don't have one available, I'd be returning the 16-85 and asking for a replacement.
08-27-2015, 05:03 AM   #6
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Unfortunately I have no second body. I will return the lens. Thank you for your help!
08-27-2015, 07:11 AM   #7
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Does it happen on any other lens? That looks like what happened with my k50 shuck turned out to be the aperture control block.
08-27-2015, 07:17 AM   #8
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My guess would be a sticky aperture lever.

08-27-2015, 12:54 PM   #9
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QuoteOriginally posted by Rondec Quote
My guess would be a sticky aperture lever.
Or a faulty aperture control module on the body. The lens is not consistently stopping down.


Steve
08-27-2015, 04:51 PM   #10
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This only happens with the HD 16-85, about one overexposed picture in a hundred correctly exposed pictures. This has never happened before with my Pentax 18-135mm WR, my Pentax 100mm WR and my Sigma 10-20 4-5.6.
08-27-2015, 05:04 PM   #11
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QuoteOriginally posted by polar bear Quote
This only happens with the HD 16-85, about one overexposed picture in a hundred correctly exposed pictures. This has never happened before with my Pentax 18-135mm WR, my Pentax 100mm WR and my Sigma 10-20 4-5.6.
... and I haven't heard of it happening before with the 16-85 either (though I do get something similar with the Sigma 35mm Art, rather more often than 1 in 100).

But your case is not just inaccurate metering: both your original photos have the same aperture, iso, and exposure time in EXIF, which CAN'T be right! So there is a miscommunication of some sort.
03-18-2016, 06:36 AM   #12
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Hi, I had the same problem with my K30 and almost all the lenses I have except maybe the 50 f1.8. It was a problem with the mirror raising and aperture lever mechanism in the body itself, nothing to do with lens contacts or the lens itself.
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