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04-26-2010, 12:51 AM   #1
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K100DS vertical line on sensor?

So somewhere around the end of September last year, I started seeing a vertical-line artifact in photos on my K100D Super. Here's a crop:

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(I've rotated this).

-It's definitely much more visible at high ISO. At 800 ISO it's much harder to find. I can just find examples of it in my ISO 200 images if I really try. This, however, is an example at 3200, where it's a pretty distinct blue-tinted line.

-it's pretty much centred on the sensor, and extends up about 2/3 of the sensor. I haven't measured it precisely.

-Firmware is 1.00. That's the one and only for a D Super, right?

Anyone experienced this? What are the likely cures? What was the likely cause? Is this pretty much a "send it to Pentax" problem?

Otherwise, the camera is working just fine.

04-26-2010, 02:19 AM   #2
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If it is always at the same position and present in all photos, then it is a camera defect, yes.
If it is not always at the same position and not present in all photos, then it is possibly the SD card.
04-26-2010, 04:08 AM   #3
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Looks like a hot pixel causing the entire row of pixels gone mad. If it wasn't the sd card, then you might shoot raw and see if the raw converters might remove it automatically. You might also use row selection to clone out that row manually in Photoshop. Replacing the CCD will be costly.
04-26-2010, 01:03 PM   #4
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Thanks for the suggestions. To answer some questions:

-I haven't checked properly (lay two images over each other in Pixelmator), but I'm almost certain it's in the same place on every pic. I'll confirm that asap.

-Good suggestion about cloning the row! That's a definite way to rescue some of my shots.

-Almost all of my shots are RAW. I usually just use iPhoto, but I previously cranked a few shots through Pentax's developer or some other. Same, though it might do better with the low-ISO shots.

-It is in every shot, but far less visible in low-ISO stuff. Presumably the system is able to compensate better. Is this normal for hot pixels?

-I'll cross-check with another card, but yes, looks like a sensor failure. Oh well, time to start saving for a K-x! I wanted movie mode anyways .

04-26-2010, 02:38 PM   #5
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It is normal for hot pixels to be more visible as the iso gets higher, and vice verse.
05-02-2010, 10:43 AM   #6
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Blue Line!

I just discovered a thin blue line on my K20D's pictures...is it definitely the sensor? I know it's not the SD card...it is visible even when taking photo without the lens on.
07-29-2010, 03:59 AM   #7
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Pentax K100D vertical line on all images / sensor

Hi,

Since some time I am having the same problem with my K100D. There are no dead/hot pixels in the area of this vertical line & it is in the same place in every image. It is approx in the middle of the image in landscape mode & covers the lower 2/3 of the sensor.

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Name:  K100D Vertical Line Problem.jpg
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I had written to Pentax Japan with photo samples of the problem.
The camera is no longer under warranty. Approx repair cost is more than US $400!!!
Sensor problem is not user related......I mean no amount of user mishandling can cause a sensor defect.......it should be covered through the life of the camera. In fact as it stands, the camera is unusable. These samples are at ISO 800...but the line is there at all ISO's....just more difficult to see.

The following is the response I got from them.

ペンタックスお客様相談センター <csd.support@pc.hoya.co.jp>

Dir Sir,

Thank you very much for inquiry of the PENTAX products.
We received your email accurately.

We confirmed your image.
There is a vertical line in the center part on the image.

Without seeing your camera it is very difficult to describe
why the said problem in your mail was happened.
Perhaps, I think that CCD of K100D is a problem.
The repair is needed.
When CCD will be exchanged, prices of parts become high amount of money.

CASE1 replace the CCD unit
Repair fee: JPY33,790-(Labor JPY9,500+Parts JPY24,290)
Postage: JPY2,400- Total:JPY36,190-

We are sorry, there is no service center in India.
Please send it to Japan if you hope for the repair.
Please bear shipping cost in that case.


We thank you again for your interest in our product.
If you have any questions, please let us know.

Sincerely yours,

----------------------------------
PENTAX
Customer Support Center
07-29-2010, 02:19 PM   #8
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Sorry to hear about your sensor and the repair costs.
QuoteOriginally posted by rcousine Quote
Almost all of my shots are RAW. I usually just use iPhoto, but I previously cranked a few shots through Pentax's developer or some other. Same, though it might do better with the low-ISO shots.
Just a protip: iPhoto converts RAW's to JPG and does all the editing on that.
So the quality is lower than a real RAW converter (Aperture, LR3, DCU, etc.)

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