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I've recently noticed this in my images during processing and, being pretty new to it, was wondering if this is what you all call vignetting
and, if so, what to do to reduce or eliminate it. This is the result after the "Auto Dev" module in StarTools. This time I chose to keep it
and crop it because my target was unharmed. Other times I use the "vignetting" selection in the "Wipe" module and it helps but I think
it does affect the center of my image a bit as well.
Any tips?
Thanks!
Larry
Attachments
Northern Triffid X.tiff (25.59 MiB) Viewed 4273 times
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
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
wow, i've never seen that before,maybe some stacking artifact , are these single frames or stacked ?, vignetting is typically circular, and it's caused by obstruction of the draw tube or filter and the shape is pretty prominent of something round obstructing the light path on the edges , a diagram can show this . the only thing i can think of that is remotely rectangle is a clip in filter.
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
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 .
Thanks!
I have a filter but I'm not using it.
Here's my 3rd object from that same session.
Note: I didn't change anything between these pics. I didn't touch the camera or any settings. Just changed targets.
Also note this one had a meridian flip but I don't think that matters as DSS seemed to handle the flipped image well.
Luckily it was another fairly small target and I was able to crop it.
Again, this happens after using the "Gradient" option in the "Wipe" module in StarTools.
The "Vignetting" option greatly reduces this but it does seem to impact the target as well.
Larry
Attachments
M51 X.tiff (25.78 MiB) Viewed 4253 times
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
Unless you have a square lens and telescope that is not vigenetting. You are getting some strange results from image registration, stacking, and calibration.
Tom
Current Equipment:
Mount: Celestron CGX-L
Scope: 130mm f7 APO
Cam: ASI071mc-pro
I'm not sure how to upload a single frame... No matter what I convert it to it's too big.
I could DropBox one if anyone would be interested but let me know what format to upload.
It's currently .CR2 but I can convert it.
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
If this is a stacked image I have had a similar experience. In every case I can think of it is because the the mount was not tracking properly and so the edges of the stacked images don't overlap precisely. I occasionally get them when guiding is going well, so I usually have to crop the image by, oh, say, 100 pixels. Then do the gradient tool. So to be clear - load the image, ST should complain about possible stacking artifacts, autodev, crop the borders, then wipe. I then go back and this time do a manual develop to get as much signal as possible vs noise.
If this is a single image - I'm stumped!
"To be good is not enough when you dream of being great"
Thanks Tom!
You want my master dark, flat and bias?
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
Thank you so much! I'm finally starting to get some decent data... It's always something I suppose...
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
Star Dad wrote: ↑Mon Mar 16, 2020 5:52 pm
If this is a stacked image I have had a similar experience. In every case I can think of it is because the the mount was not tracking properly and so the edges of the stacked images don't overlap precisely. I occasionally get them when guiding is going well, so I usually have to crop the image by, oh, say, 100 pixels. Then do the gradient tool. So to be clear - load the image, ST should complain about possible stacking artifacts, autodev, crop the borders, then wipe. I then go back and this time do a manual develop to get as much signal as possible vs noise.
If this is a single image - I'm stumped!
This is stacked and yes, ST warns that there are stacking artifacts. The first AutoDev doesn't reveal much at all. This doesn't show up until after gradient wipe. It's only after that that I can see what needs to be cropped and it's quite a bit! I struggled with DSS settings in the past. I wonder if I have something screwy in there...
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
Thanks yobbo!
Do you use DSS and ST or something else?
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
Larry 1969 wrote: ↑Mon Mar 16, 2020 7:10 pm
Thanks yobbo!
Do you use DSS and ST or something else?
Larry
Yes I use dss aka deep sky stacker, I can help you on some settings if you choose that route to stack your data
Thanks! I'm looking at my settings now but I'm afraid there's a lot I don't understand...
I'm using the beta of StarTools that was supposed to work with no white balancing. Is that the version you're using?
If so, I'd be curious to see your settings. Maybe you could upload the DSS settings file to DropBox and I can import it to try if you have some time?
Thanks again!
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
I may have found the problem. I had the stacking mode set to "intersection". I set it to "standard" and I'm restacking...
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