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Monday, January 9, 2017

Bright nebulae of the central Cygnus, eleven panel mosaic finalized

My first photo session for the year 2017 was at January fourth. As a result, I was able to finalize my mosaic image of the central Cygnus. It has now eleven panels stitched together seamlessly.  I have made two versions, as usually. This one is in mapped colors and another, yet unpublished, in visual spectrum.

Mosaic images can be highly work intensive but the final resolution is great. They are very suitable for extreme large prints. Original resolution is around 20.000 x 9000 pixels.

Bright nebulae of the central Cygnus, eleven panels
Please, click for a large image, 2100 x 1000 pixels

The photo is in mapped colors from the light emitted by an ionized elements, 
red=sulphur, green=hydrogen and blue=oxygen. A mosaic image with seven panels. Original image has a resolution of about 20.000 x 9000 pixels. Image spans about five degrees of sky horizontally.

Sub images taken for the mosaic in chronological order
Please, click for a large images

Three panels, January 7. 2016

One panel, December 27 2016

Four panels combined, December 27 2016

Five panels, January 1. 2017

Eight panels, January 1. 2017

The final four panels, January 4. 2017

Please, click for a large image

An older wide field photo with  the Canon EF 200mm f1.8 camera lens and Baader narrowband filters. Area of interest is marked as a white rectangle. Part of the color data is taken from this wide field photo.

Technical details

Processing work flow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 21 iterations, added at 25% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope
Canon EF 200mm f1.8 camera optics (For S-II and O-III channels)
10-micron 1000
Meade LX200 GPS 12" (For S-II and O-III channels)

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL
QHY9 (For S-II and O-III channels)

Astrodon filter, 5 nm H-alpha
Baader filter, 8,5 nm O-III
Baader filter, 8 nm S-II

Exposure times for all seven panels
H-alpha, 39 x 1200 s binned 2x2 
O-III, 22 x 1200 s binned 4x4 = 
S-II,  22 x 1200 s binned 4x4 

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