M20

Here is an image of M20 taken on one of the most interesting imaging days I've had at our cottage. From our cottage, M20 hugs the tree line and is buried in light pollution. Click on the image to see an earlier attempt with older Meade optics and an unmodified Canon 350D. Check out my astro imaging blog for details on what made the day "interesting" for imaging.
Object M20 (Trifid Nebula) RA 18:02.7 Dec +22:58
Exposure 72 minutes  (24 X 3 minutes)
ISO 1600
Camera Canon 60Da DSLR
Optics Prime focus of a 200mm SkyWatcher f/5 Newtonian reflector with Televu Paracor for a total focal length of 1150 mm
Location

Marion Bridge, Nova Scotia

Processing This image was processed entirely in Images Plus. Calibration with flats and a synthetic bias as darks are unnecessary with most modern DSLR's with built in dark current suppression. Initial noise reduction using statistical filtering, stretch using masked ArcSinH, Two iterations of SMI processing to bring out the faint outer envelope. Feature mask used to split stars out of the image. Nebula image sharpened using multi-scale decomposition. Blue boosted slightly using additive colour balance with a mask. Masked noise reduction, using a frequency domain low pass filter. Stars recombined with the nebula. Image cropped and binned by two.