Cygnus Loop

 Posted: Apr 19th, 2026
Show astrometry on hover
NGC
IC
HD
Technical Info
Telescope/Lens: Samyang 135 mm. f/2 ED
Camera: ZWO ASI533MC Pro
Mount: JUWEI 14
Guide Scope: Askar 32 f4
Guide Camera: ZWO ASI120MM Mini
Software: Siril, Lightroom
Accessories: EAF, EFW MINI, ASIAIR MINI, Dounstep Rings, Printed Rings
Exposure:
15 x 300" ISO/Gain: 100 - Optolong L-eXtreme
Orange, Bortle 6 zone:
 Samara, Russia
 Apr 17th, 2026
1 h 15 m
208
Resolution: 2779x2133 px
Scale: 2050 KB

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Comments

Hello, could you please tell me what causes the coma on the right edge?
6 Jun, 2026 Reply
Poppy8micro Replied to Nickolay
Hello, the tilt is curved.
6 Jun, 2026 Reply
Nickolay Replied to Poppy8micro
And how is this treated? It's due to micro-play in the bayonet mount, as I understand. I'm just considering such a combo with the 533 MC. Are there tilt adjusters on marketplaces—have you come across any?
6 Jun, 2026 Reply
Poppy8micro Replied to Nickolay
There is play in the lens block, and it is not easily fixable. I do not recommend a color camera; with lenses, monochrome is preferable.
6 Jun, 2026 Reply
Nickolay Replied to Poppy8micro
Why isn't a color lens suitable? What are the advantages of a monochrome?
6 Jun, 2026 Reply
Poppy8micro Replied to Nickolay
Lenses are not designed for night sky photography and do not focus colors like telescopes do. The channels will be out of focus — one in focus, two not so much — so you have to photograph the channels separately. The aperture also produces diffraction spikes. A lens is a compromise, especially with color. I got rid of the setup and am saving up for 2600mm; in terms of field of view, with my Askar it will be almost the same as the 585 and 135mm Samyang, but without the hassle.
6 Jun, 2026 Reply
Nickolay Replied to Poppy8micro
Thank you, there's something to think about now :-|
6 Jun, 2026 Reply
Poppy8micro Replied to Nickolay
Again, focusing is manual, or you can rig up a strap-based mount. The lens has a shallow depth of field. In general, you could try something from Soviet optics, like the Jupiter 37, to get a feel for it. Cheap and effective.
7 Jun, 2026 Reply
Nickolay Replied to Poppy8micro
Jupiter is done. Out of curiosity, I'll compare them, of course. It's just that my setup is tuned for Samyang — rings, mounting plates, and other accessories.
7 Jun, 2026 Reply
Poppy8micro Replied to Nickolay
Well, give it a try — you can always sell it. Some people get really great results with lenses, so maybe that's your path. I've put that topic aside for now. If I ever go monochrome, I might try again — I kept the accessories and adapters. I recommend getting a Canon mount — it's wider and not as flimsy as Nikon.
7 Jun, 2026 Reply
Nickolay Replied to Poppy8micro
It's late — I already have a Samyang for Nikon. I should have switched earlier, but now it's too late. Everything is built around Nikon: adapters, lenses, two DSLRs.
7 Jun, 2026 Reply

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