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04-16-2012, 07:32 PM   #1
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k10d - Strange exposure inconsistecy.

Bought a used k10. The camera appears to be in excellent condition except for the following problem. The camera will take pictures at apertures of f2.8, or faster(lower aperture number), but as the aperture slows down, the light flares out the picture. These pictures were taken in EVENING LIGHT, the ones taken during the day were almost completely flared out to white. The lens used for below is a SMC Pentax-DA 1:2.4 35mm AL, but issue shows up on every lens tried. I changed the aperture, but let the camera adjust the shutter speed. Here are examples and there exif info.

Does anyone have any idea what would cause this color/flare inconsistency?

Name:  k10d 157.JPG
Views: 484
Size:  616.8 KB
Model - PENTAX K10D
Software - K10D Ver 1.31
DateTime - 2011:04:16 19:27:01
YCbCrPositioning - Co-Sited
ExifOffset - 2330
ExposureTime - 1/15 seconds
FNumber - 2.40
ExposureProgram - Normal program
ISOSpeedRatings - 100
DateTimeOriginal - 2011:04:16 19:27:01
DateTimeDigitized - 2011:04:16 19:27:01
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MeteringMode - Center weighted average
Flash - Flash not fired, compulsory flash mode
FocalLength - 35.00 mm
FlashPixVersion - 0100
ColorSpace - sRGB
InteroperabilityOffset - 49852
SensingMethod - One-chip color area sensor
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
FocalLengthIn35mmFilm - 52 mm
SceneCaptureType - Standard
Contrast - Normal
Saturation - Normal
Sharpness - Normal
SubjectDistanceRange - Close view

Name:  k10d 158.JPG
Views: 473
Size:  601.5 KB
Model - PENTAX K10D
Software - K10D Ver 1.31
DateTime - 2011:04:16 19:27:12
YCbCrPositioning - Co-Sited
ExifOffset - 2330
ExposureTime - 1/6 seconds
FNumber - 4.50
ExposureProgram - Aperture priority
ISOSpeedRatings - 100
DateTimeOriginal - 2011:04:16 19:27:12
DateTimeDigitized - 2011:04:16 19:27:12
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MeteringMode - Center weighted average
Flash - Flash not fired, compulsory flash mode
FocalLength - 35.00 mm
FlashPixVersion - 0100
ColorSpace - sRGB
InteroperabilityOffset - 49852
SensingMethod - One-chip color area sensor
FileSource - Other
SceneType - Other
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
FocalLengthIn35mmFilm - 52 mm
SceneCaptureType - Standard
Contrast - Normal
Saturation - Normal
Sharpness - Normal
SubjectDistanceRange - Close view

Name:  k10d 159.JPG
Views: 424
Size:  635.7 KB
Model - PENTAX K10D
Software - K10D Ver 1.31
DateTime - 2011:04:16 19:27:23
YCbCrPositioning - Co-Sited
ExifOffset - 2330
ExposureTime - 1/2 seconds
FNumber - 8.00
ExposureProgram - Aperture priority
ISOSpeedRatings - 100
DateTimeOriginal - 2011:04:16 19:27:23
DateTimeDigitized - 2011:04:16 19:27:23
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MeteringMode - Center weighted average
Flash - Flash not fired, compulsory flash mode
FocalLength - 35.00 mm
FlashPixVersion - 0100
ColorSpace - sRGB
InteroperabilityOffset - 49852
SensingMethod - One-chip color area sensor
FileSource - Other
SceneType - Other
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
FocalLengthIn35mmFilm - 52 mm
SceneCaptureType - Standard
Contrast - Normal
Saturation - Normal
Sharpness - Normal
SubjectDistanceRange - Close view

Name:  k10d 160.JPG
Views: 421
Size:  600.7 KB
Model - PENTAX K10D
Software - K10D Ver 1.31
DateTime - 2011:04:16 19:27:24
YCbCrPositioning - Co-Sited
ExifOffset - 2330
ExposureTime - 1/2 seconds
FNumber - 8.00
ExposureProgram - Aperture priority
ISOSpeedRatings - 100
ExifVersion - 0221
DateTimeOriginal - 2011:04:16 19:27:24
DateTimeDigitized - 2011:04:16 19:27:24
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MeteringMode - Center weighted average
Flash - Flash not fired, compulsory flash mode
FocalLength - 35.00 mm
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 3872
ExifImageHeight - 2592
InteroperabilityOffset - 49852
SensingMethod - One-chip color area sensor
FileSource - Other
SceneType - Other
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
FocalLengthIn35mmFilm - 52 mm
SceneCaptureType - Standard
Contrast - Normal
Saturation - Normal
Sharpness - Normal
SubjectDistanceRange - Close view

Name:  k10d 161.JPG
Views: 431
Size:  333.1 KB
Model - PENTAX K10D
Software - K10D Ver 1.31
DateTime - 2011:04:16 19:27:35
YCbCrPositioning - Co-Sited
ExifOffset - 2330
ExposureTime - 1 seconds
FNumber - 11.00
ExposureProgram - Aperture priority
ISOSpeedRatings - 100
DateTimeOriginal - 2011:04:16 19:27:35
DateTimeDigitized - 2011:04:16 19:27:35
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MeteringMode - Center weighted average
Flash - Flash not fired, compulsory flash mode
FocalLength - 35.00 mm
FlashPixVersion - 0100
ColorSpace - sRGB
InteroperabilityOffset - 49852
SensingMethod - One-chip color area sensor
FileSource - Other
SceneType - Other
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
FocalLengthIn35mmFilm - 52 mm
SceneCaptureType - Standard
Contrast - Normal
Saturation - Normal
Sharpness - Normal
SubjectDistanceRange - Close view

Thanks In Advance,
Reed

04-16-2012, 07:41 PM   #2
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Posts: 4,616
The DOF is the same in all your photos so it seems like your aperture is stuck.

Take off the lens and move the little arm that stick out at the back of the mount, that should move the aperture of the lens.
If that works then look at the camera and his mount, turn the camera on and pull the on button further so that you enable the DOF preview mode, there should be something moving on the left side in the mirrorbox.
04-16-2012, 07:45 PM   #3
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Based on your explanation and photos it appears to me that the camera is either not engaging the lens lever that stops down the lens during shooting or the actuation mechanism in the camera is not functioning. Suggest you try the DOF preview fuction on the camera while looking through the viewfinder. I'll bet that you won't see any darkening of the VF when doing so with a stopped down setting. My guess is that the K10 needs to go in for repair.
04-17-2012, 07:50 AM   #4
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Reed,

Have you done the test with another lens to see if that's the same behavior?

Edit: Sorry, seems you mentioned you have done that.

04-17-2012, 07:54 AM   #5
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QuoteOriginally posted by Anvh Quote
The DOF is the same in all your photos so it seems like your aperture is stuck.

Take off the lens and move the little arm that stick out at the back of the mount, that should move the aperture of the lens.
If that works then look at the camera and his mount, turn the camera on and pull the on button further so that you enable the DOF preview mode, there should be something moving on the left side in the mirrorbox.
I'm with Anvh, it looks like the aperture is sticking wide open. To be sure it's a lens issue and not a camera one try a different lens on it and see if it is ok.
while checking the DOF preview would show whether it was stopping down or not, it won't tell you if the camera or the lens is the issue
04-17-2012, 09:37 AM   #6
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Original Poster
Anvh, I think you nailed it. I had a chance to play with the camera and lenses at lunchtime. I checked the lenses they all work fine. Taking the lens off and clicking to DOF on the power button, the little arm doesn't move on the left of the k10 mirror, but does on the k20. Is there something that can be done to fix this without sending it to a shop? The camera is in excellent condition except for this issue.

Thank you all for the responses!

Reed
04-17-2012, 10:00 AM   #7
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it's a trip to the shop unfortunately AFAIK, I did some looking for a service manual which would allow the handy to attempt repairs but can't find one
worst case use it as a shoot wide open camera or with taks where you can manually stop them down
04-17-2012, 04:41 PM   #8
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QuoteOriginally posted by eddie1960 Quote
it's a trip to the shop unfortunately AFAIK, I did some looking for a service manual which would allow the handy to attempt repairs but can't find one
worst case use it as a shoot wide open camera or with taks where you can manually stop them down

Here is a link to download the Pentax K10D Service Manual. The PDF has a passcode given in the download but to save time (8639).

To OP: Do discharge the capacitor! If you don't know what a capacitor is- you should really send it in, because it can kill you (sorry, but needs to be said).

Downloads


Last edited by jamesm007; 04-17-2012 at 05:00 PM.
04-19-2012, 12:46 AM   #9
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ummm no the cap wont kill you but it will hurt. as for the apature link not moving, i had it happen to my k10 a while back and it ended out being the actuator slipping over the top of the slide that contacts the actual arm of the lens. bit hard to tell without showing you but if nothings broken as such it will be a quick an easy fix for most pentax savie stores.
cheers.
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