Much larger image HERE: http://1.bp.blogspot.com/-nV2LTVTGkDA/UkREdIyCyvI/AAAAAAAAKJQ/mJKKgMUiNxY/s0/Cygnus_MediumRED.jpg
Large 18-panels mosaic about Nebulae of Cygnus constellation in narrowband colors.
Some technical information about the image:
- Original size for the 18 panels mosaic 15.000 x10.000 pixels
- Resolution 5,5 arch seconds / pixel
- Image center, RA 20h 27s, Dec 43d 30m 45s
- Area of this image is about 22 x14 degrees of sky.
- Full Moon has an angular diameter of 0,5 degrees, it fits to the area of this image about 1230 times!
Technical details for the 18 panel mosaic
I have used a very fast camera optics, Canon EF 200mm f1.8, full open to collect all the data in this mosaic. Due that, total exposure time is relatively short, ~22h, there are some very dim formations clearly visible.
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and mosaic combine in PS CS3.
Optics, Canon EF 200mm camera lens at f1.8
Image Scale, ~5,5 arcseconds/pixel
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Filter, Baader 7nm H-alpha
Here are all technical data for the H-alpha emission line:
I had ready made eight panel mosaic with all three emission line, H-a, S-II and O-III I managed to collect very little new color data but I had some earlier images from this area. I used all of them to finalize this color composition. Gaps between the color data are filled with an averaged colors from surrounding color data.
Here are links to older images used for the missing color data
North America and the Pelican Nebulae:
Lower parts of previous image:
Sharpless 119, Sh2-119:
The Crescent Nebula, a wide field image: