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NGC1491

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AT8RC at f/8 
Atik 383L+ 
Baader SII/Ha/OIII filters Losmandy G11 guided with Atik OAG/PHD Guiding/Lodestar

SII=6x20min
Ha=8x20min
OIII=9x20min

False RGB color image from narrowband filters. R=Ha+24%SII 
G=OIII 
B=OIII+15%Ha