Imaging telescopes or lenses: Samyang 135mm f/2 ED UMC
Imaging cameras: Canon Eos6da
Mounts: SkyWatcher Star Adventurer
Software: Photoshop · Pleiades Astrophoto, S.L. Pix Insight
Dates:Aug. 8, 2015
Frames: 514x180"
Integration: 25.7 hours
Avg. Moon age: 23.62 days
Avg. Moon phase: 34.63%
Astrometry.net job: 3277571
RA center: 20h 47' 50"
DEC center: +66° 30' 13"
Pixel scale: 15.617 arcsec/pixel
Orientation: -95.173 degrees
Field radius: 9.234 degrees
Resolution: 3540x2379
Locations: my lovely garden, near Vienna, Austria
Data source: Traveller
On some nights between August and November 2015 I trained my Eos6d with Samyangs wonderful 135mm at f/2 towards Cepheus. A lot of objects are contained, prominent Iris nebula, Ghost nebula under it, reflection nebula vdB143 on bottom, to the right the flying bat Sh2-129 (no trace of Outters 4 here), above it dark Barnard 150 the seahorse nebula, and right almost top the pair: open cluster NG6939 and firewheel galaxy NGC6946. A little above center you may detect 10,6mag galaxy NGC6951. While there is no catalog number available for the object as a whole, the field is strongly dominated by a complex of dust clouds, which extend far beyond the picture frame.
Note the little ring artefact around Mira star T Cephei, a little under the Iris, it stands out even on the single raw pics, and can be seen only around this star. I know from another photographer, that he also got it on his photos with a different optical train, so while it is surely an artefact of imaging, it must also be connected somehow to the properties of this special star.
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