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petemass
member
Reged: 08/19/07
Posts: 15
Loc: CT, USA
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Well last night I battled the frost, cold  and effects of New years celebrations to get my first OK images of Saturn...
Its been a huge struggle to get good atmosphere, focus and camera settings ... I used a 2X Barlow and settled on 1/10 sec exposure at ISO 1000 and collected a few hundred shots . I stacked them in astrostack.... so far I have found that it is doing a good job of stacking but the user interface is difficult. I've used DSS for nebula but it doesn't seem to like planets ... Anyone have suggestions for a good planet stacking application?
Anyway .. I noticed all of my Saturn images ( RAW format using the Canon 40d) have a color shift ... ie. Blue to the right and red to the left. I checked the camera this morning by setting a flashlight on a table pointed at the camera using the 135 lens and I do not see a shift.
I meticulously collimated the scope last night to try and eliminate this. The problem shows with or without the Barlow.... My theories on the cause are ( in no particular order):
1.I'm really not that good at collimating
2.The new 40D is so sensitive it can see the doppler light shift of the side of Saturn rotating toward earth VS away 
3.I should not practice GWI ( gazing while intoxicated)
4.My C1100 is better used as an emergency fire starter than a lens for the Canon
5.This is a normal problem with AP
Vote now!
Here is a Saturn image next to a star image. Both show the shift
Happy New Year
Pete
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Celestron CPC 1100
Canon 40d
Many eyepieces, webcams and software apps
No idea how to use all this stuff
Ability to take countless blurry images of the universe
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moron392
scholastic sledgehammer
Reged: 08/20/07
Posts: 813
Loc: Charlotte, NC
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my vote is for #3 
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"If you've done something right, people won't be sure you've done anything at all."
http://www.freewebs.com/moron392/index.htm
60mm meade ngc60 refractor.
Meade 70AZ-TR (short one)
50mm homemade refractor (occasionally with a solar filter)
starblast4.5EQ
6mm,15mm expanse eyepieces
9mm meade Mh eyepiece,17.5mm Meade MA
nikon 7x35's
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Tonk
Post Laureate
Reged: 08/19/04
Posts: 4353
Loc: Leeds, UK, 54N
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You missed out atmospheric refraction - which is what it is - but otherwise I'd also vote #3
You can fix this by spliting the RGB chanels into separate images (grey scale), aligning the images to coincide and then recombining as an RGB image
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Televue 85, GM-8/Gemini, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB)
Coronado SM60/BF10, Baader Herschel Wedge
Leeds Sky Clock Ripon Sky Clock
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petemass
member
Reged: 08/19/07
Posts: 15
Loc: CT, USA
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Quote:
You missed out atmospheric refraction - which is what it is - but otherwise I'd also vote #3
You can fix this by spliting the RGB chanels into separate images (grey scale), aligning the images to coincide and then recombining as an RGB image
Eeeek .... really is there an automated way to do this ... I've got hundreds of shots!!
Pete
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Celestron CPC 1100
Canon 40d
Many eyepieces, webcams and software apps
No idea how to use all this stuff
Ability to take countless blurry images of the universe
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diabolic
super member
Reged: 10/19/06
Posts: 112
Loc: Austin, TX
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Try using Registax for planets. I think it allows you to do RGB alignment as well. I don't know if it reads raw files though. I use it with webcam captures on planets.
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Will
WO Megrez 110 ED • WO ZenithStar 80 II ED • Celestron 9.25" Carbon Fiber SCT • Orion XT10i • Meade ETX-125AT
Canon 40D • Meade DSI-Pro II • SPC900NC
Celestron CGE
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