The "Crescent" Nebula NGC 6888 in Cygnus

Posted: Jul 3rd, 2025

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Technical Info

Telescope/Lens: Celestron C8 SCT

Camera: SVBONY SV605CC

Mount: Celestron Advanced GT

Guide Scope: Angeleyes 30F4

Guide Camera: Datyson T7M

Software: Siril, StarNet++

Accessories: Celestron 0.63 reducer, SV226 filter drawer

Exposure:

240 x 30" ISO/Gain: 130 - Svbony UV/IR Cut

Green zoneLight Pollution:

Pushchino Chuvashiya Mpc M12 Puschino, Russia

Oct 1st, 2024

THE "CRESCENT" NEBULA NGC 6888 IN CYGNUS

Telescope/Lens: Celestron C8 SCT
Camera: SVBONY SV605CC
Mount: Celestron Advanced GT 
Guide Scope: Angeleyes 30F4
Guide Camera: Datyson T7M
Software: Siril, StarNet++
Accessories: Celestron 0.63 reducer, SV226 filter drawer

Pushchino Chuvashiya Mpc M12 Puschino, Russia
Light Pollution: Green zone

Exposure:
240 x 30" ISO/Gain: 130 - Svbony UV/IR Cut

Crescent Nebula NGC 6888 (also designated LBN 203) is an emission nebula in the constellation Cygnus.
<br>Equipment: Celestron C8-XLT, Celestron 0.63 reducer, Svbony SV605CC, Celestron CG5-GT, guide Angeleyes 30F4+Datyson T7M.
<br>240x30sec, gain=130, offset=50, t=0. Taken as a test of imaging capability at 1260mm focal length on the C8 on the night of October 1, 2024, in Pushchino, Chuvashia. MPC:M12 under haze, wind gusts, and FWHM 6-7.
<br>Conclusion - imaging with the C8 and a reducer is possible with a camera using an IMX533 sensor (but not larger - distortions will appear), but you need to catch good atmospheric conditions, refocus during the night (focus shifts noticeably with temperature changes), and accumulate more photons, as the telescope is not fast.

Original size: https://deepskyhosting.com/YiUlHhh
Author: vazhorov

2 h 0 m

459

Crescent Nebula NGC 6888 (also designated LBN 203) is an emission nebula in the constellation Cygnus.
Equipment: Celestron C8-XLT, Celestron 0.63 reducer, Svbony SV605CC, Celestron CG5-GT, guide Angeleyes 30F4+Datyson T7M.
240x30sec, gain=130, offset=50, t=0. Taken as a test of imaging capability at 1260mm focal length on the C8 on the night of October 1, 2024, in Pushchino, Chuvashia. MPC:M12 under haze, wind gusts, and FWHM 6-7.
Conclusion - imaging with the C8 and a reducer is possible with a camera using an IMX533 sensor (but not larger - distortions will appear), but you need to catch good atmospheric conditions, refocus during the night (focus shifts noticeably with temperature changes), and accumulate more photons, as the telescope is not fast.

Resolution: 2969x2974 px

Scale: 8431 KB