What causes this?
- Larry 1969
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What causes this?
Every single time I try to image M78 I get this weird artifact. It's happened several times over the past 2 years with different cameras.
Some of you may remember my Silveer Sliver Galaxy image with the line through it even when imaged a few months apart. This is the same but the artifact is different.
Any ideas what could cause this? M78 is a really cool target and I'd like to spend some time on it, but not if I'm going to have to deal with tis every time...
Thiis was 51 x 3 min exposures before moonrise with 50 flats and 50 dark flats.
Thanks!
Larry
Some of you may remember my Silveer Sliver Galaxy image with the line through it even when imaged a few months apart. This is the same but the artifact is different.
Any ideas what could cause this? M78 is a really cool target and I'd like to spend some time on it, but not if I'm going to have to deal with tis every time...
Thiis was 51 x 3 min exposures before moonrise with 50 flats and 50 dark flats.
Thanks!
Larry
For visual:
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
- AstroBee
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Re: What causes this?
It looks like reflection from nearby Alnitak. Do you have a dew shield in place to prevent off-axis reflections like this?
Greg M.~ "Ad Astra per Aspera"
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
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
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
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- Larry 1969
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Re: What causes this?
I do have a dew shield in place. Maybe I could fashion a longer one and try again.
Thanks for the suggestion!
Larry
For visual:
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
- Larry 1969
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Re: What causes this?
I took this on the same night with the same calibration frames but the moon had risen and was a player.
The moon was 80% or so and I suspect it is responsible for my rather poor flats correction, but that glaring artifact is not present.
This makes me think there is something in the sky causing it. I will make a longer dew shield and try again.
Thanks!
Larry
The moon was 80% or so and I suspect it is responsible for my rather poor flats correction, but that glaring artifact is not present.
This makes me think there is something in the sky causing it. I will make a longer dew shield and try again.
Thanks!
Larry
For visual:
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
- starfield
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Re: What causes this?
I'd vote for a reflection in this case too.
Scopes: Esprit 100, 12.5" Telekit Dob
Camera: 294 MC Pro, 224 mc, 2600mm
Guiding: ZWO 290 mini on 120mm guide scope
Mounts: EQ6R-Pro, EQ Platform.
Filters: Optolong L-Pro & L-Enhance, Chroma 36mm LRGB, 5nm HA, 3nm OIII, 3nm SII.
Software: SharpCap, SGP, StarTools 1.7, Photoshop, Pixinsight
The Death Star Observatory
Astro Photos:https://www.astrobin.com/users/starfield/
Camera: 294 MC Pro, 224 mc, 2600mm
Guiding: ZWO 290 mini on 120mm guide scope
Mounts: EQ6R-Pro, EQ Platform.
Filters: Optolong L-Pro & L-Enhance, Chroma 36mm LRGB, 5nm HA, 3nm OIII, 3nm SII.
Software: SharpCap, SGP, StarTools 1.7, Photoshop, Pixinsight
The Death Star Observatory
Astro Photos:https://www.astrobin.com/users/starfield/
- Larry 1969
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Re: What causes this?
I made a temporary dew shield extender from some large, black paper. It wasn't perfectly round, and I had to remove it to take the flats, so I got some poor correction but, that glaring, ringing artifact was substantially reduced. I had rotated the camera 120 degrees from the original image, and you can still see some of it, but it's greatly reduced.
Any idea where I can get a 24" dew shield for my 8" reflector?
Larry
Any idea where I can get a 24" dew shield for my 8" reflector?
Larry
For visual:
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
- AstroBee
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Re: What causes this?
You might want to look at an arts & crafts supply type store for a sheet of black abs plastic. You may need to get a different color and paint it flat black on the inside.
If you want the best material, you should get flockboard. The only place I know of that sells it is this source. https://www.fpi-protostar.com/flockboard.htm
He has a bad reputation of taking a very long time to fill orders because I think he waits till he has enough orders to buy a full roll before he fills the smaller orders. It took me almost 3 months to get my material but it is a very, very nice, stiff, extremely flat black material that makes a perfect dewshield.
https://youtu.be/S2zy6jdRIzE
If you want the best material, you should get flockboard. The only place I know of that sells it is this source. https://www.fpi-protostar.com/flockboard.htm
He has a bad reputation of taking a very long time to fill orders because I think he waits till he has enough orders to buy a full roll before he fills the smaller orders. It took me almost 3 months to get my material but it is a very, very nice, stiff, extremely flat black material that makes a perfect dewshield.
https://youtu.be/S2zy6jdRIzE
Greg M.~ "Ad Astra per Aspera"
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
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
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
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- Larry 1969
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Re: What causes this?
Thanks!AstroBee wrote: ↑Sun Feb 27, 2022 8:58 pm You might want to look at an arts & crafts supply type store for a sheet of black abs plastic. You may need to get a different color and paint it flat black on the inside.
If you want the best material, you should get flockboard. The only place I know of that sells it is this source. https://www.fpi-protostar.com/flockboard.htm
He has a bad reputation of taking a very long time to fill orders because I think he waits till he has enough orders to buy a full roll before he fills the smaller orders. It took me almost 3 months to get my material but it is a very, very nice, stiff, extremely flat black material that makes a perfect dewshield.
https://youtu.be/S2zy6jdRIzE
Larry
For visual:
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
10" Skywatcher collapsible goto dob, various EP's and a Celestron StarSense auto align.
For imaging:
Orion 8" astrograph 800mm @ F3.9
Eq6-R Pro controlled by APT via EQmod with an OTA mounted mini PC
Tele Vue Paracorr Type 2 coma corrector
Altair Hypercam 26C
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