Hemisphere:  Northern
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The Wall - color version, 


            Ivaylo Stoynov
The Wall - color version
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The Wall - color version

Technical card

Imaging telescopes or lenses: William Optics Megrez 80 FD

Imaging cameras: QHYCCD QHY 22

Mounts: Takahashi EM-200

Guiding telescopes or lenses: ZWO 60/280 GuideScope

Guiding cameras: QHY5L-II Mono

Focal reducers: William Optics FF/FR 0.8x II

Software: PixInsight PixInsinght 1.8 RC7  ·  APT - Astro Photography Tool

Filters: Astrodon O-III 3nm  ·  Astrodon HII-3nm

Dates:Aug. 7, 2018Aug. 12, 2018

Astrodon HII-3nm: 13x900" -20C bin 1x1
Astrodon O-III 3nm: 8x900" -20C bin 1x1

Integration: 5.2 hours

Avg. Moon age: 13.15 days

Avg. Moon phase: 11.51%

Temperature: 11.33

Basic astrometry details

Astrometry.net job: 2199910

RA center: 20h 59' 34"

DEC center: +43° 31' 30"

Pixel scale: 2.903 arcsec/pixel

Orientation: 71.684 degrees

Field radius: 0.952 degrees

Resolution: 1822x1500

Locations: Nedelkovo, near Sofia, Bulgaria

Data source: Backyard


Having a quite long list of wider targets decided to explore the capabilities of the WO Megrez 80 FD and the focal reducer WO reducer x0.8 Type II which is designed mainly for the ZenithStar 66. Cygnus was well high in the sky and it was not hard to pickup a bright nice target for the HII filter :). Focusing was easy with just one 50mm extender tube. The blind plate-solving in APT showed that f/6.9 is reduced to f/5.9 at 470mm focal length and the corners are quite good :)

After the initial tests ran one 10min exposure and was fascinated by the raw image so went for series of 15 minutes subs. The result from that session was really great (see the mono version) and in the next possible night I have added few more HII and several OIII subs for HHOO image.

I'm really happy with the result and am looking forward trying the faint targets in my list :)



Ivaylo Stoynov
License: None (All rights reserved)

Sky plot

Sky plot


The Wall - color version, 


            Ivaylo Stoynov