Reverse vignetting?
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- Larry 1969
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Re: Reverse vignetting?
My focuser sits 6 inches inside the tube and I have a dew shield that extends 8 inches past that. You think I need more?
Larry
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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Re: Reverse vignetting?
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Re: Reverse vignetting?
I'll have to check next time I set up and that doesn't look like anytime soon...
Thanks!
Larry
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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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Re: Reverse vignetting?
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
- Larry 1969
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Re: Reverse vignetting?
I bought a tool for that. It's basically a Cheshire eyepiece with a clear filter attached that has concentric circles. Maybe I misused it???
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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Re: Reverse vignetting?
if you have any error with the light cone illuminating center on theLarry 1969 wrote: ↑Mon Dec 06, 2021 5:03 pmI bought a tool for that. It's basically a Cheshire eyepiece with a clear filter attached that has concentric circles. Maybe I misused it???
i rack my focuser out somewhere near to the same focus postion as my camera and then look through the cheshire , you might want to try different focus position just to generaly get the
if it isn't comming out in your flats then really the problem is most likely not with the scope but an outside source ,moon ectt, street light .
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Reverse vignetting?
I also had reverse vignetting when I started using an astro camera using just flats and no biases. The
So my best guess is some sort of reflection. I hope you find the cause.
- Larry 1969
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Re: Reverse vignetting?
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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Re: Reverse vignetting?
it's actualy some pretty reasonable detail and sharpness in the center , it looks like longer exposer time will seatle out the noise in the outer regions,but you do face skyglow comming in doing so ..Larry 1969 wrote: ↑Wed Dec 08, 2021 10:59 pm Thanks for all the replies and suggestions. I get so few clear nights to test anything out. I was able to get out for a few hours this past weekend and I spent it on NGC 1333. It was low in the east and I think there was some terrible sky glow in that area so the image is crap, but I took new flats at 32,000 ADU and the vignetting seems solved. I couldn't deal with the noise in this but I didn't notice any vignetting to speak of.
Larry
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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