Any Nebula dark or light  
ring

ring(Paul Aisen)

Acquisition Date : 9/28/11
Camera : Canon T2i, modified (Hap Griffin)
f 5.6
Camera Settings : 23 subs, 30-600 seconds each, 51 minutes total
iso 1600
Telescope : Tak TSA 120
Mount : ASA DDM60 unguided
Processing Package / Processing Applied : camera control backyard EOS, calibrated, aligned, stacked in ImagesPlus, processing PS CSF, Astronomy Tools, GradientXTerminator, Noise Ninja

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