This image of the Cygnus Loop was taken using Astronomik narrowband filters attached to the front of a 135mm lens piggybacked on my ten inch reflector mounted on a Vixen Atlux mount. I was also using an Atik 383L mono CCD set on times 1 bin mode.
I captured two minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of noise and vignetting in the final image.
The total exposure times were 40 minutes using a H A filter, 30 minutes using an O111 filter, 20 minutes using a S11 filter and 6 minutes using a blue filter.
Hubble Palette
RGB + Hubble Palette
RGB
