Wednesday, November 9, 2011
IC405 & 410
IC 405 & 410
In constellation Auriga
HST-palette, from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen.
An experimental starless version to show the actual nebula
An experimental starless version to show the actual nebula
A clear night at last!
I shot about three hours of H-alpaha light for IC405 & 410, after finalizing H-a for my new project , "Cirrus of Cygnus". (It will be a three panel narrow band mosaic about dimmer outer structures of Cygnus Nebula complex.)
Little by little I have managed to reduce tilt between my CCD and the Cnon EF 200mm f1.8 lens.
At f1.8, every single micron makes a big difference. Working with an extreme fast lens, like this, is very demanding. Tolerances are very small, the critical focus zone is only 7microns, that's 7/1000mm!
Little by little I have managed to reduce tilt between my CCD and the Cnon EF 200mm f1.8 lens.
At f1.8, every single micron makes a big difference. Working with an extreme fast lens, like this, is very demanding. Tolerances are very small, the critical focus zone is only 7microns, that's 7/1000mm!
Other channels, O-III and S-II are taken from an older image from year 2008. Star colors are borrowed from an RGB-image, shot at 2007.
R=Hydrogen + Sulfur, G=Oxygen and B=Oxygen + Hydrogen.
An animated image to show the nebula with and without stars.
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Levels, curves and color combine in PS CS3.
Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5 arcseconds/pixel
New exposures H-alpha 13x900s,
S-II and O-III information are from an older image
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