This picture was taken using a monochrome, raw-modified camera with my "poor-man's" Hα fiter. The filter consists of an Orion Skyglow filter together with a Parkes-21, orange filter and the normal IR-block filter. Between them these pass a band between 640 nm and the beginning of the IR block. The major light emitted by the nebula in that region is at the Hα wavelength of 656 nm.
In order to stack three filters and not to get them too close to the much-larger, focal-reducer lens, I had to increase the distance between the lens and the camera resulting in a greater reduction of focal length, so this picture is at a smaller scale than the previous one.
If you cannot see the darker parts of the nebula in the top-righthand and bottom-lefthand corners, then move your mouse over the image to see one with the gamma increased to 1.4.
Date and Time
20th January 2007 19:18 to 19:38 UT
Camera
Atik ATK-1 HS raw modified
Telescope
LX200 with 0.33 focal reducer
Capture
K3CCDTools. 1/50, 1/33, 1/25, 1, 2, 5 sec exposures, 80% gain, ~100 frames each
Processing
K3CCDTools. Each avi stacked and saved in png16 format.
Registax. Stacking of the separate images, wavelets 1-2 = 10.
Home Back to DSOs