Weird arcs in images
- Star Dad
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Weird arcs in images
Hello all -
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.
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.
"To be good is not enough when you dream of being great"
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
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
Wow, I'm sorry, but I don't have any words for you. I'm just as stumped as you are, and I own the ASI 294MC lPro Camera, and I've never seen anything like this in any of my images.
∞ Primary Scopes: #1: Celestron CPC1100 #2: 8" f/7.5 Dob #3: CR150HD f/8 6" frac
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Searching the skies since 1966. "I never met a scope I didn't want to keep."
∞ 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
∞ Cameras: #1: ZWO ASI294MC Pro #2: 662MC #3: 120MC, Canon T3i, Orion SSAG, WYZE Cam3
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- The Wave Catcher
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Re: Weird arcs in images
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.
Steve Yates
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- Jockinireland
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Re: Weird arcs in images
Can you make the stacked but unprocessed image available on a shared drive like one drive or drop box and I'll take a look and see if I can work out what's going on. Also provide details of the capture, number duration of images, how stacked, etc.
Scope: Skywatcher Evostar 80ED (SW 0.85 FR/FF) on a SW NEQ6Pro
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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
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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
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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.
Greg M.~ "Ad Astra per Aspera"
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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.
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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.
"To be good is not enough when you dream of being great"
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
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
Great, lets see it then
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Guiding: SW Finderguider and QHY5
Scopes: Skywatcher ED80, Skywatcher ED120, William Optics ZS71, Samyang 135MM F2 lens,
Cameras: Atik460EX, Atik428EX, Canon 1100D
Filters: Baader
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- Star Dad
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Re: Weird arcs in images
Ok, I'll resize it and post the Rosette Nebula which I just processed from November.... but I do 90% of my work on Linux and the image is on the windows side of things. And lately I've been having arguments with the windows boot loader which insists on being THE boot loader, so I've had to separate my dual boot system. I'll post a pic tomorrow as I'm running out of time for today.
"To be good is not enough when you dream of being great"
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
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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