Horizontal banding w/DSLR

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Horizontal banding w/DSLR

Post by Craig » Tue Oct 03, 2017 1:24 pm

Has anyone had a horizontal banding issues using a DSLR ?

It's possibly that I'm only using a battery and not DC.

Any thoughts ?

Thanks
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Re: Horizontal banding w/DSLR

Post by h2opolo » Tue Oct 03, 2017 1:31 pm

You gotta an image of it?
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Tue Oct 03, 2017 1:32 pm

Short answer is yes....There is a script in Pixinsight and Noels Actions for Photoshop that will reduce banding in images. A lot of times heavy dithering will take care of the banding as well as a good set of bias and dark calibration files.
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Re: Horizontal banding w/DSLR

Post by Craig » Tue Oct 03, 2017 1:40 pm

Trying to figure out how to convert tiff to jpeg or something i can post here. It was a shot of M101 20 x 5m lights 15 x 5m darks and 15 bias. Also used heavy dither. Don't have pixinsight or the astronomy action tools for photoshop yet. :(
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Tue Oct 03, 2017 1:54 pm

Noels actions are very beneficial in my opinion if you don't have pixinsight. I am not sure of any method of removing the banding without some sort of action. Maybe someone can chime in that knows of something else. Did you also use darks and bias calibration files?
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Re: Horizontal banding w/DSLR

Post by Craig » Tue Oct 03, 2017 2:09 pm

Does it work w/ Adobe photoshop CS2 ?
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Tue Oct 03, 2017 2:16 pm

Sure does, thats what i use.
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Re: Horizontal banding w/DSLR

Post by Craig » Tue Oct 03, 2017 2:17 pm

Ok thanks I'll buy and download
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Tue Oct 03, 2017 2:26 pm

IF you didn't use calibration files, you should also do that as well. BIAS files are simple.....set fastest exposure you can do on your dslr, and shoot like 40 of em. Darks, same temp, iso and time. Sorry if you know that already, just throwing helpful info out there.
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Re: Horizontal banding w/DSLR

Post by Craig » Tue Oct 03, 2017 6:41 pm

Wow I used the horizontal banding removal action 20 times and still Bandung there. I’ll try dropping my ISO down to 800 from 1600 and see if that helps for next time. Maybe shorter subs ?
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Tue Oct 03, 2017 6:55 pm

Shouldn't make a difference for length. I used to shoot up to 10 mins all the time. Sometimes I got them and sometimes I didn't. Make sure mirror lockup isn't on and your LCD screen is off when shooting. Good calib filea as well. Maybe even tey some flats.
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Re: Horizontal banding w/DSLR

Post by Doug » Tue Oct 03, 2017 7:06 pm

Are you dithering? I've had occasions where I wasn't dithering and I got banding when I stacked the images.

Also, CS2 is FREE, search YouTube and you'll see it's FREE! May sure you download it from Adobe and not some shady site.
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Re: Horizontal banding w/DSLR

Post by Craig » Tue Oct 03, 2017 7:17 pm

Yes Doug I was using the heavy dither my target was M101 I had

20 x 5 minute Lights
15 x 5 minute darks
15 x O-01 seconds
Stacked in DSS And I used Photoshop 2 with Noel’s actions
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Re: Horizontal banding w/DSLR

Post by h2opolo » Wed Oct 04, 2017 6:37 am

You can always download the trial version of Pixinsight and use the script called "CanonBandingReduction"
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Re: Horizontal banding w/DSLR

Post by Doug » Wed Oct 04, 2017 3:36 pm

Didn't know there was a named routine for Canon Banding.
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Re: Horizontal banding w/DSLR

Post by h2opolo » Wed Oct 04, 2017 4:09 pm

Yeah me either. I just discovered it. Somebody must have needed it and wrote one but it's there
Carbon ED 127 FCD 100 SERIES, GSO RC-8, WO ED 102, WO GT71 & Zenith Star 61
Losmandy G11G
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Re: Horizontal banding w/DSLR

Post by Craig » Mon Oct 09, 2017 8:34 am

Here's the banding i was talking about

https://www.dropbox.com/s/vhs2xkapdi84s1b/M101.tif?dl=0
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Mon Oct 09, 2017 8:47 am

Wow. That is very harsh banding never seen it that bad before.
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Re: Horizontal banding w/DSLR

Post by Craig » Mon Oct 09, 2017 9:55 am

https://www.dropbox.com/s/x42en4usmql4d ... 2.jpg?dl=0" onclick="window.open(this.href);return false;

That's M81-82
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Re: Horizontal banding w/DSLR

Post by Rudeviewer » Mon Oct 09, 2017 10:28 am

There has to be some kind of problem going on. What program are you using to stack your images? You might look to see if the banding appears on single images as well if those are stacks that you posted.
Zach
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Williams Optics GT81
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