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Old 02-04-2017, 05:52 PM
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Bassnut (Fred)
Narrowfield rules!

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Join Date: Nov 2006
Location: Torquay
Posts: 5,065
RCW 75 Elephant Trunk Nebula in NB RGB

Hi Guys

Also known as Gum 48a. In Centaurus.
Ha tainted red and RGB blend.
No OIII or SII, but quite a bit of NII, but It was identical to Ha, so not used.
Would be interesting to know why Ha and NII, but no OIII or SII

Big here

Taken on an RCOS 10" RC Scope at f9, SBIG STXL6303E Camera and PME mount at itelescopes Siding Spring Observatory.
Processed with CCDstack, Star Tools and Photoshop. 37 hrs Total exposure time.
Ha RGB

Ha 34hrs, 40min subs bin1. RGB 3 hrs, 20min subs bin1
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Click for full-size image (RCW75 Ha RGB sml.jpg)
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