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Cygnus Loop NGC6960 NGC6992

Category:Deep Sky
Published:
1949
Cygnus Loop  NGC6960 NGC6992NGC 6974NGC 6960NGC 6979NGC 6992NGC 6995IC 1340
Resolution:
3552x3552 px
File size:
3666 KB

Photo description / processing

As they say, a small RASA. Samyang 135mm lens with a ZWO ASI676MC camera, 3x3 degree field, pixel scale 3 arcseconds per pixel. I made an aperture stop in front of the lens and glued an M48 ring into it to screw in a filter. I shot for one night and couldn’t figure out why there were strange reflections in the image and the stars looked triangular. I tried adjusting everything, but nothing helped. Then I gave up and placed the filter between the lens and the camera—everything fell into place. But I kept the aperture stop in front of the lens. I shot for one night, totaling almost 2 hours. I really liked the level of detail, though of course more integration time would help. A year ago, I photographed the same target with an Askar 65 PHQ telescope using an Askar 0.75x reducer for 65 PHQ telescopes and a ToupTek IMX571 camera. Of course, there’s a nuance—I shot in September when the nights are dark, while this time it was still twilight. But the difference in resolution isn’t that big. See for yourself.

Technical information

Telescope/Lens
Samyang 135mm f/2 ED UMC
Camera
ZWO ASI676MC
Mount
МТ-120
Guide Scope
50mm Finder Scope
Guide Camera
T7M
Software
N.I.N.A., Pixinsight, Adobe Photoshop
Location
Екатеринбург, район озера Глухое., Россия

Light pollution

Orange, Bortle 6 zone

Date taken

Exposure

  • 57 × 120″ · ISO/Gain: 180 · LAIDA 7hm ·

Total exposure: 1 h 54 m

Photo versions

Cygnus Loop  NGC6960 NGC6992
Current photoUpdated
Cygnus Loop NGC6960 NGC6992

Jul 18th, 2024

1 h 54 m

As they say, a small RASA. Samyang 135mm lens with a ZWO ASI676MC camera, 3x3 degree field, pixel scale 3 arcseconds per pixel. I made an aperture stop in front of the lens and glued an M48 ring into it to screw in a filter. I shot for one night and couldn’t figure out why there were strange reflections in the image and the stars looked triangular. I tried adjusting everything, but nothing helped. Then I gave up and placed the filter between the lens and the camera—everything fell into place. But I kept the aperture stop in front of the lens. I shot for one night, totaling almost 2 hours. I really liked the level of detail, though of course more integration time would help. A year ago, I photographed the same target with an Askar 65 PHQ telescope using an Askar 0.75x reducer for 65 PHQ telescopes and a ToupTek IMX571 camera. Of course, there’s a nuance—I shot in September when the nights are dark, while this time it was still twilight. But the difference in resolution isn’t that big. See for yourself.

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More photos by Oleg Novoselov