RBA Premium Astrophotography

North American Nebula

Posted: August 25th, 2008



Larger size: 2400x1592

DATE
August 25th, 2008, 11:00pm to 12:45am PST

PHOTO
Exposure: 10 x 10 minutes
Focal: 432mm, f/4.3

EQUIPMENT
Imaging Scope: NP101is with 0.8 Focal Reducer
Camera:Canon 40D IR/UV filter
Guide camera: StarShootAutoGuider
Guide scope: Orion Short 80mm
Mount: Takahashi EM-400

SITE & CONDITIONS
Site: Montebello, CA
Seeing: Good
Transparency: Regular

SOFTWARE
Stacking: DeepSkyStacker
Processing: PixInsight + Photoshop

COMMENTS
I knew the North American nebula was big, but I was surprised when I noticed I couldn't make it fit completely in the image at a 432mm focal length! And this is with the default 2.4" focuser from the NP101-is (no adapters reducing it to 2" or anything like that) and the Canon CMOS chip which isn't small.

In any case, this nebula is not one of my favorites for imaging, and during processing I wasn't sure what to do with it, so the processing is indeed very basic. It was however my first "official" image with the 0.8x focal reducer from TeleVue, so that should make it memorable :-)



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