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05-20-2010, 11:17 AM   #1
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Is this a banding issue?

See this picture (clickable for fullsize):



About two-thirds down the way there is a blue line accross the frame. Is this a banding issue? I've never really read up on this, only heard the term come by once. What is it, what can be done? Could it be this is just because the sensor was hot (I had been shooting continuously for a long time when I took this photo)?

Help much appreciated!

05-20-2010, 11:24 AM   #2
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Sure looks like it to me! I'm assuming it's taken at high ISO too, right? What camera?
05-20-2010, 11:39 AM   #3
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Yes, ISO 1600 on a K10D. I just tried another ISO1600 shot, and there was no such line, so I guess, luckily, it only shows up after heating up...
05-20-2010, 02:12 PM   #4
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Well, it's an issue, but it's not what people usually call "banding". That would be a much broader, fuzzier band - and usually vertical - where the noise inherent at high ISO forms a visible pattern.

05-20-2010, 03:05 PM   #5
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Vertical banding for sure, but not quite severe considered it's iso1600. Every camera body is different given the same model. First thing to check when buying any new camera. Also, there is a horizontal line which is more disturbing. They will be quite visible if you check the blue channel in photoshop.
05-20-2010, 03:24 PM   #6
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The horizontal blue line is what I was referring to when I said this was not "banding" in the usual sense. If there is a slight amount of vertical pattern to the noise as well, it's pretty subtle in this example - I've seen cases where it was compeltely obvious even at screen size.
05-20-2010, 03:48 PM   #7
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I guess with a little imagination you could say this photo has some vertical patterns in the noise, but it's not obvious so it's not important. The horizontal line is the what I meant indeed. I hope it doesn't show up too often because then I might feel inclined to spend money on a new body (oh no, imagine that!)
05-20-2010, 08:45 PM   #8
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It's sensor problem, I had some problem previously on my K10D

See the bottom of the image (much more visible on full size)



I sent my K10D for repair and Pentax replaced the sensor to fix the problem

05-21-2010, 01:36 AM   #9
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How much did it cost?
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