K20D vertical banding

Prieni · 2008-11-01T13:52:59+0000

On the weekend I finally found time to take a stroll in the autumn landscape. At the shore I took this photo (with the Sigma 105 macro, EXIF intact): 8 seconds later I took a second shot with same settings: Back home I started converting the day's bounty with SilkyPix. One step of the routine is to correct CA and for that I usually zoom to 400% in one of the corners. When working on the first shot I noticed regular vertical lines repeating, one line with lighter pixels, one line with darker pixels etc. This pattern filled the whole image. Here's a 100% crop of the lower left corner of the first shot: The same for the latter shot: So two questions: 1. What the heck is going on there? 2. Should I put this thread up over on depressing review and stop the time until the first one bites? Ok, question 2 is not that serious. I'm not overly concerned as it hasn't happened for the last 4000+ shots. But something similar happened when the camera was new (see thread )

Pentax Digital SLRsPentax Digital SLRs

Add Comment

piotro piotro

369 posts
18 years
London

Posted 26/05/2009 - 19:50 Link

Great, not a full month after I've got mine K20D back from over a month long "repair" (probably one of the last ones before they outsourced it) and have exactly the same (looking) issue, and the season for airshows just started...

--
http://piotr.zenfolio.com

Edited by piotro: 26/05/2009 - 19:50

golfdiesel golfdiesel

1130 posts
20 years
Netherlands

Posted 26/05/2009 - 19:55 Link

piotro wrote:
Great, not a full month after I've got mine K20D back from over a month long "repair" (probably one of the last ones before they outsourced it) and have exactly the same (looking) issue, and the season for airshows just started...

But the problem as gone? That is strange? I took some photo's of the blue sky lately and I never saw any banding.
At what maginifaction did you start seeing it? What ISO setting did you use or is it visible in all ISO settings?

ttk ttk

2227 posts
18 years

Posted 26/05/2009 - 20:01 Link

Have you sent it back yet or are you going to see what happens?

Tel,

piotro piotro

369 posts
18 years
London

Posted 26/05/2009 - 20:07 Link

It is not showing always, but it hasn't gone, it just needs some combination of ISO, or whatever else may be involved to make this issue happen.
Hasn't sent it back yet, just discovered it, PPing some photos from Southend airshow and "tada", don't really want to send it back , airshows seasons just started and I have some other trips planned and would like to have the camera with me...
Some example (as it was before, distinct strip at the left strip, and then banding over whole frame), plus some nasty dirt spot , that is not a problem anyway . Example (just did "equalize" it shows it very well):
http://img40.imageshack.us/my.php?image=pio4759banding2.jpg

--
http://piotr.zenfolio.com

Edited by piotro: 26/05/2009 - 20:11

ttk ttk

2227 posts
18 years

Posted 26/05/2009 - 20:10 Link

piotro wrote:
It is not showing always, but it hasn't gone, it just needs some combination of ISO, or whatever else may be involved to make this issue happen.
Hasn't sent it back yet, just discovered it, PPing some photos from Southend airshow and "tada", don't really want to send it back , airshows seasons just started and I have some other trips planned and would like to have the camera with me...

Fingers crossed then

Tel,

Cuchulainn Cuchulainn

540 posts
17 years

Posted 09/10/2009 - 14:56 Link

Yup, despite having had the sensor block replaced, I've begun to notice the issue on shots from my K20D again. I'm not impressed - some of the pictures were taken on honeymoon. It's not happening as often as the first time around, but then it seemed to become a more regular occurance over time..