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07-14-2008, 02:38 PM   #1
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k10d sudden overexposure

I've owned my k10d for a couple of months now and it has been doing a brilliant job until now. Suddenly it has started overexposing all my shots by about +2ev. I've only tested in AV mode and the green mode but I'm assuming the result would be the same in all modes. I only have one lens which is a Pentax 18-250 so I can't tell if it's the camera, the lens or me to blame. Has anyone else seen a similar problem?
I've uploaded a couple of examples to flickr to show you the problem, unfortunately I've just taken these in my dimly lit living room so the overexposure isn't as noticeable as it is on a sunny day, the problem should still be pretty obvious though.
This is the exposure the camera thinks is a good idea.
IMGP2248.JPG on Flickr - Photo Sharing!
This is with compensation set to -2ev
IMGP2247.JPG on Flickr - Photo Sharing!
Any Ideas would be gratefully received.
jim

07-14-2008, 04:36 PM   #2
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Hi,
I think the ever-helpful forum members will need a little more to go with. For example, what metering pattern are you using (spot, center-weighted, or matrix)?

I might also suggest using an example where the subject has less dynamic range. Proper metering of a subject that includes both an indoors room and a bunch of unshaded light bulbs is pretty subjective. Did you want the room or the light fixture to be properly exposed. It is pretty hard to get both.

Steve

Last edited by stevebrot; 07-14-2008 at 06:40 PM.
07-14-2008, 04:46 PM   #3
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I agree with stevebrot

We need full exif data in the shots to begin to understand this.
07-14-2008, 06:02 PM   #4
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Have you tried removing the lens and reseating it? Could be a contact problem.

07-14-2008, 09:41 PM   #5
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Your sample foto don't have EXIF information.

Please post sample pictures with EXIF info intact.
07-15-2008, 01:32 AM   #6
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overexposure

Hi,

If you click on more properties to the right of the photo you should see all the exif info. The metering is set to matrix, but the result is the same in a metering modes. Sorry for the subject chosen, I just fired it off quickly last night just to get something to show you. The result is always the same in all conditions though, always about +2ev, a well lit outdoor scene is pretty much whited out.

jim
07-15-2008, 02:03 AM   #7
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For the over-exposed image:

Camera Make: PENTAX Corporation
Camera Model: PENTAX K10D
Image Date: 2008:07:14 21:09:27
Flash Used: No
Focal Length: 18.0mm (35mm equivalent: 27mm)
Exposure Time: 1.500 s
Aperture: f/4.0
ISO equiv: 400
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)


For the properly exposed image:

Camera Make: PENTAX Corporation
Camera Model: PENTAX K10D
Image Date: 2008:07:14 21:09:18
Flash Used: No
Focal Length: 18.0mm (35mm equivalent: 27mm)
Exposure Time: 0.300 s (1/3)
Aperture: f/4.0
ISO equiv: 400
Exposure Bias: -2.00
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
Exposure Mode: Manual



Flickr doesn't retain EXIF info unless you view the original file in its original size.
07-15-2008, 02:20 AM   #8
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any chance you are using exposure lock and metering off something else not the bright spot?

also it seems to be a very long exposure 1.5 seconds wide open at 400 ISO.

07-15-2008, 03:20 AM   #9
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I'm not using ae lock. 1.5seconds is a very long exposure, but that's what the camera thinks it needs, that's the problem.
07-15-2008, 04:50 AM   #10
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It could be it has just gone out of wack, but maybe something else is causing the trouble.
When i sent in my D2H to fix the dead AE board in 2004, it came back with exposure problems. IIRC it was over exposing by +1.7-2.0

Two trips back to Nikon to get that fixed up to were it was originally.

So yes, it could have gotten out of wack, but I'd check all my settings first, just to make sure you did not change any original modes.

Dave
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