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Saturday, November 19, 2011
in constellation Cygnus
A two panel mosaic, bicolor composition from H-alpha (Red) and O-III (Green & Blue).
This combination is very close to a visual spectrum.
I noticed, that my two projects, Cirrus of Cygnus and Butterfly to Crescent, are partly overlapping.
I will shoot couple of more panels to build a six panel mosaic from this area, when ever the weather allows me to do so...
I wen trough my raw images for Butterfly to Crescent project and I noticed, there was a one O-III frame usable, others was destroyed by speeding clouds. I processed the O-III frame and made a bicolor mosaic composition at top.
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 40% weight
Levels, curves and color combine in PS CS3.
Optics, Canon EF 200mm camera lens at f1.8
Image Scale, ~5 arcseconds/pixel
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Filter, Baader 7nm H-alpha and Baader O-III 8,5nm
Exposures for two panels,
H-a, 6x600s Binned 1x1
O-III, 1x300s Binned 2x2
H-a, 4x900s Binned 1x1
O-III, 6x300s Binned 3x3