k10d - Strange exposure inconsistecy.

reed_page · 04-16-2012, 07:32 PM

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?

Attachment 124543
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

Attachment 124544
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: 551
Size: 635.7 KB

Name: k10d 159.JPG
Views: 551
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: 593
Size: 600.7 KB

Name: k10d 160.JPG
Views: 593
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: 602
Size: 333.1 KB

Name: k10d 161.JPG
Views: 602
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

Anvh · 04-16-2012, 07:41 PM

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.

**darylk** · 04-16-2012, 07:45 PM

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.

farhagh · 04-17-2012, 07:50 AM

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.

eddie1960 · 04-17-2012, 07:54 AM

Originally posted by Anvh

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

reed_page · 04-17-2012, 09:37 AM

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

eddie1960 · 04-17-2012, 10:00 AM

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

jamesm007 · 04-17-2012, 04:41 PM

Originally posted by eddie1960

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

forestG · 04-19-2012, 12:46 AM

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.

04-16-2012, 07:32 PM	#1
reed_page Senior Member Join Date: Feb 2012 Location: Shrewsbury, NJ Photos: Gallery Posts: 108	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? Attachment 124543 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 Attachment 124544 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 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 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 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

04-17-2012, 04:41 PM	#8
jamesm007 Veteran Member Join Date: Jul 2008 Location: Detroit MI, USA Posts: 508	Originally posted by eddie1960 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.

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04-16-2012, 07:41 PM	#2
Anvh Veteran Member Join Date: Sep 2011 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
darylk Site Supporter Join Date: Sep 2010 Location: Blue Hill, Nebraska Photos: Gallery Posts: 494	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
farhagh Veteran Member Join Date: Nov 2008 Location: Ohio Photos: Albums Posts: 339	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
eddie1960 Veteran Member Join Date: Aug 2010 Location: Toronto Photos: Gallery \| Albums Posts: 13,666	Originally posted by Anvh 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
reed_page Senior Member Join Date: Feb 2012 Location: Shrewsbury, NJ Photos: Gallery Posts: 108 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
eddie1960 Veteran Member Join Date: Aug 2010 Location: Toronto Photos: Gallery \| Albums Posts: 13,666	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

04-19-2012, 12:46 AM	#9
forestG Inactive Account Join Date: Oct 2007 Location: melb, au Photos: Gallery Posts: 100	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.