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06-11-2013, 06:36 AM   #1
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Bokeh banding

These pics were taken with 2 different lenses on my K-r. The insect (Dogbane Beetle) was with a Tamron SP 90mm macro lens, the flower (Prairie Smoke) with the Pentax DA 55-300m (at 300m). Both show banding in the bokeh parallel to dominant diagonal lines in the photo. I'm thinking of finally making the switch from JPEG to RAW - is that something that wouldn't happen in RAW?

Last edited by jacamar; 06-11-2013 at 06:56 AM.
06-11-2013, 06:57 AM   #2
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That... could just be because something in the background is diagonal? I'm not really sure this is an odd phenomenon.
06-11-2013, 07:05 AM   #3
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This looks indeed like somthing in the background, banding by jpeg compresion isn't that smooth.

One other option might be the compresion to a smaller colour space, you could try different method for the compresion to see if that change anything.
We have that trouble a lot at work.
06-11-2013, 07:11 AM   #4
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In both cases the background is natural vegetation - in the second shot especially there are several bands, which you wouldn't expect. Must admit I haven't noticed in in any of my other shots, but then not all of them have strong diagonals.

06-11-2013, 08:04 AM   #5
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At what point in the downloading/transfer process are you first seeing the banding? On the camera rear screen? On your PC screen?

Also, these look like big crops. Can you post the originals?
06-11-2013, 08:30 AM   #6
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The Prairie Smoke pic is uncropped, and the banding shows on the camera screen.

The beetle shot was taken last summer so I no longer have it on the camera card. here is the uncropped version:

A second, similar shot I took on that occasion has banding as well.
06-11-2013, 11:31 AM   #7

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I'd suggest shooting some test images with the lens wide open, the light good, and with a complex background that will remove the possibility that all you are seeing are features of the background. To test for the sort of vertical banding you are seeing, something like a chessboard as the scene background would make sense.
06-12-2013, 01:33 PM   #8
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Thanks for the advice. I tried a few test shots with different backgrounds and didn't come up with any further banding, but I'll be keeping an eye out for it in future photos.


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