Weird arcs in images
- Star Dad
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Weird arcs in images
I am getting the following image upon stacking and stretching them. This is from an ASI294MC-cooled. This started happening about six weeks ago - (yeah, I'm just finding time to process them... been a very busy fall season).
I do recall that several months ago (I *really* wish I had put it in my log book) the camera fell off it's table while I was taking darks. I did not see any damage whatsoever - not even a ding. I'm not sure but I thought it was in the summer...long before these "arcs" started showing up. Besides should not (more recent) darks be dealing with background noise?
I'm completely stumped.
Orion 203mm/f4.9/1000mm, converted TASCO 114mm/f9/1000mm to steam punk, Meade 114mm/f9/1000, Coronado PST, Orion EQ-G, Ioptron Mini-Tower and iEQ30, Canon 70D, ASI120MM,ASI294MC, Ioptron SkyHunter
- JayTee
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Re: Weird arcs in images
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
∞ G&G Scopes: #1: Meade 102mm f/7.8 #2: Bresser 102mm f/4.5
∞ Guide Scopes: 70 & 80mm fracs -- The El Cheapo Bros.
∞ Mounts: iOptron CEM70AG, SW EQ6R, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
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- The Wave Catcher
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Re: Weird arcs in images
Astro-Tech AT102ED, 102 mm, F/7, ED Achromatic Refractor
Astro-Tech AT80ED, 80 mm, F/7, ED Achromatic Refractor
Bresser AR102s, 102 mm, f/4.5, Achromatic Refractor
Explore Scientific Twilight I Alt/Az Mount
Bresser Nano Alt/Az Mount
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Re: Weird arcs in images
Guiding; SW Evoguide 50ED, ASI 120mm mini
Meade 8" LX200 GPS on wedge (Guided with a cheapo 50mm guidescope and a ZWO ASI 120mm mini)
Sharpstar 61EDPH II (with dedicated 0.8 reducer) with wiliam Optics 32mm uniguide
Camera: ASI2600MC pro. QHY 163M with ZWO 7nm NB filters, Canon EOS700D astro mod
Secondary mount: Skywatcher StarAdventurer
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Re: Weird arcs in images
That's what I'm thinking too. It looks like an 8bit image from a 14bit original. Somewhere along the line in your processing you have downsampled the image to 8bit.The Wave Catcher wrote: ↑Wed Dec 27, 2023 1:35 am This usually occurs when images don’t have enough discrete colors or amplitude steps. For instance, if a typical image only had 16 colors, similar gradient steps would be seen in images of the sky or horizon. I can’t answer specifically for your particular camera, but it is probably a setting somewhere that got changed.
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
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Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
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- Star Dad
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Re: Weird arcs in images
OMG! It's solved. I awoke this morning at 2:30AM and could not get back to sleep thinking about this. I got on my computer and went to the directory where the above image was stacked. Deep Sky Stacker (The Wave Catcher wrote: ↑Wed Dec 27, 2023 1:35 am This usually occurs when images don’t have enough discrete colors or amplitude steps. For instance, if a typical image only had 16 colors, similar gradient steps would be seen in images of the sky or horizon. I can’t answer specifically for your particular camera, but it is probably a setting somewhere that got changed.
Orion 203mm/f4.9/1000mm, converted TASCO 114mm/f9/1000mm to steam punk, Meade 114mm/f9/1000, Coronado PST, Orion EQ-G, Ioptron Mini-Tower and iEQ30, Canon 70D, ASI120MM,ASI294MC, Ioptron SkyHunter
- carastro
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Re: Weird arcs in images
Guiding: SW Finderguider and QHY5
Scopes: Skywatcher ED80, Skywatcher ED120, William Optics ZS71, Samyang 135MM F2 lens,
Cameras: Atik460EX, Atik428EX, Canon 1100D
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- Star Dad
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Re: Weird arcs in images
Orion 203mm/f4.9/1000mm, converted TASCO 114mm/f9/1000mm to steam punk, Meade 114mm/f9/1000, Coronado PST, Orion EQ-G, Ioptron Mini-Tower and iEQ30, Canon 70D, ASI120MM,ASI294MC, Ioptron SkyHunter
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