NGC7293 Helix Nebula in Halpha. [OIII] and Helium II from AP180EDT f/9 and FLI ML4022 wtih Custom Scientific Emission Line Filters

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5 hours of Helium II

taken on August 29 and 30, 2009 from my ranch in the California Gold Country

Astro-Physics AP180EDT f/9

FLI Microline ML4022 operated at -26C

Astro-Physics 80/900mm guide scope with adjustable rings

SBIG ST7ME guide camera

Astro-Physics AP1200GTO mount

20 exposures of 15 minutes binned 2x2 Helium II (468.6nm)

20 exposures of 15 minutes binned 2x2 Hydrogen Alpha 

8 exposures of 15 minutes binned 2x2 [OIII]

12 hours total exposure time

 

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