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Technical card

Imaging telescope or lens: Samyang 135mm f/2

Imaging camera: Atik 460EX mono

Mount: SkyWatcher NEQ3

Guiding telescope or lens: APM Telescopes Finder 60mm

Guiding camera: Astrolumina QHY5L-II m

Software: PixInsightMain Sequence Software SequenceGeneratorProPHD2 Guiding

Filter: Baader Ha 3.5nm

Resolution: 6522x5202

Dates: July 25, 2017

Frames: 108x300"

Integration: 9.0 hours

Avg. Moon age: 1.77 days

Avg. Moon phase: 3.51%

Astrometry.net job: 1686169

RA center: 308.596 degrees

DEC center: 42.101 degrees

Pixel scale: 7.236 arcsec/pixel

Orientation: -178.796 degrees

Field radius: 8.385 degrees

Locations: Mallorca, Son Macia, Mallorca, Spain

Description

This is the central part of the constellation Cygnus, including Deneb and Sadr as main stars, covering a field of about 13 by 10 degrees. This image focusses on the rich H-alpha nebulosity in this region. In contains some of the famous emission nebulae, e.g. the North America Nebula, the Pelican Nebula, and the Crescent Nebula. However, what I find even more exciting is the sheer mass of nebulosity that covers the whole fields with dramatic ripples and dark lanes.

This is the first light for my new "enforced H-alpha" filter from Baader with a width of 3.5nm, works extremely well with the Samyang 135mm lens and the ATIK 460ex camera - no halos and very clean subs. At the same time it is my first attempt at an larger wide-field mosaic. This image is a 3 x 3 mosaic composed in Pixinsight using the MosaicByCoordinantes and GradientMergeMosaic tools. I was a bit worried about combining this mosaic, but it turned out to be really straight-forward. Apart from this I only used MureDenoise, LocalHistogramEqualization and simple HistogramTransformations - no masks or star magic involved.

Make sure to zoom into this image as far as you can...

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Cygnus Region – Wide-Field Mosaic, DeepSkyView