Of course, M27 is also blue, but that wouldn't show up through this H-alpha filter. H-alpha radiation, which falls in the red part of the spectrum, shines very brightly from this planetary nebula. This image is only 16 minutes of exposure, just two subframes. Note the spikes coming from the lemon. Longer exposures show more structure outside of what is here. I was testing, however. I'd like to return to this object with the 10" Newt.
Telescope: Orion 120ST f/5 Achromat w/WO ff/fr 0.8 II (so effectively at f/4)
Camera & Exposure: Atik 16, 2x8'
Filter: Astronomik Profi 6nm H-alpha
Guiding: Borg 50mm, Meade DSI Pro, PHD
Mount: Takahashi NJP
Software: Nebulosity, Maxim DL, Photoshop CS3
Location: The Woodlands, TX
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