Visual spectrum colors from narrowband channels.

It took couple of Months to shoot all the needed frames for this mosaic and I did use every possible clear moment. This mosaic image has eight full size (3500x2500 pixels) panels and the final image has a massive size of 7.000 x 10.000 pixels. For every panel, I shot three different images of emission of ionized elements, Hydrogen, Sulfur and Oxygen. (H-a, S-II and O-III). This image is a mapped color composition showing Hydrogen as Green, Sulfur as Red and Oxygen as Blue.

Image spans about 10 degrees horizontally and 14 degrees vertically. (Apparent size of the full Moon is ~30 arc minutes = 0,5 degrees. Full moon fits to this are at about 480 times!)

Generally this mosaic took a lots of work to finalize and it was kind of difficult to process since the star field is so very dense at galactic plane. Overall I'm happy with this result!
Northern constellation Cygnus (aka "Norther Cross") locates at the plane of our Milky Way and it's a treasure box of beautiful nebulae. Bright supergigant star Gamma Cygni can be seen at center Right, next to the Butterfly Nebula, IC 1318. The bright Blueish spot at upper Right is the Crescent Nebula, NGC 6888.At top Left, a beautiful open cluster, NGC 6819 , can be faintly seen. (It's well resolved in full res. image)Two bright objects at bottom middle are Sh2-112 and a bluish Sh2-115. At bottom Right are parts of the North America and Pelicän nebulae visible. The propeller Nebulacan be seen at center left. There are many other objects in this large field.

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.

Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9
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 Eight panels,

Panel 1 (Top Left),
H-a, 3x900s Binned 1x1
O-III, 2x300s Binned 3x3
S-II, 2x300s Binned 3x3

Panel 2 (Top Right),
H-a, 5x900s Binned 1x1
O-III, 6x300s Binned 3x3
S-II, 6x300s Binned 3x3


Panel 3 (Upper Left),
H-a, 3x900s Binned 1x1
O-III, 3x300s Binned 3x3
S-II, 2x300s Binned 3x3


Panel 4 (Upper Right),
H-a, 4x900s Binned 1x1
O-III, 6x300s Binned 3x3
S-II, 6x300 Binned 3x3


Panel 5 (Lower Left),
H-a, 5x900s Binned 1x1
O-III, 3x300s Binned 3x3
S-II, 2x300s Binned 3x3


Panel 6 (Lower Right),
H-a, 8x900s Binned 1x1
O-III, 6x300s Binned 3x3
S-II, 6x300 Binned 3x3


Panel 7 (Bottom Left),
H-a, 6x900s Binned 1x1
O-III, 3x300s Binned 3x3
S-II, 2x300 Binned 3x3


Panel 8 (Bottom Right),
H-a, 4x900s Binned 1x1
O-III, 2x300s Binned 3x3
S-II, 2x300s Binned 3x3

Total exposure time for all channels ~15h