This image of the Medusa nebula was taken under clear sky conditions with the first quarter moonlight to contend with. It lies in the constellation of Canis Minor.
I captured this image using my 80mm, f/6.3 refractor, a Vixen Atlux mount, PHD auto-guiding, an Atik 383L mono CCD camera and a set of Astronomic narrowband filters, H-alpha, SII and OIII.
I capture five minute sub frames with matching dark frames and combined them with flat fields to reduce the effect of vignetting in the final image.
The total exposure times were 60 minutes for each narrowband filter and 20 minutes for a blue filter.
Click on an image to get a closer view.
Narrowband luminance with RGB colour
Narrowband Hubble palette
RGB and narrowband colour
Bi colour
