The reflection nebula "Iris" (NGC 7023) and the dark dust clouds enveloping it in the constellation Cepheus.

 Posted: Mar 22nd, 2026
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IC
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Technical Info
Telescope/Lens: Sky-Watcher Quattro 150P
Camera: Nikon D3300a
Mount: HEQ5 Pro Belt
Guide Scope: Datison 60/250
Guide Camera: ZWO ASI 120MM mini
Software: Electra Stacking, Siril, GraXpert, Photoshop 2020
Accessories: 2" МPCC Mark III, ZWO AsiAir-mini, ZWO EAF
Exposure:
148 x 300" ISO/Gain: 800 - SvBony SLC 2"
Yellow, Bortle 5 zone:
 Sochi Harciz Vtoroy, Russia
 Mar 14th, 2026
12 h 20 m
269
Resolution: 5000x3339 px
Scale: 80817 KB
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Comments

Very cool! Do you shoot darks on the same night? How do you match the temperature of the darks to the lights? With flats it's easier since they're quick to shoot. Or is the temperature difference of calibration frames not that critical? I never quite mastered it on my 600D.
9 May, 2026 Reply
Pavel Gorlov Replied to Poppy8micro
Thank you from the bottom of my heart)))
The thing is, I don’t know the sensor temperature at which the lights were taken. My Nikon DSLR doesn’t have a sensor temperature meter on the matrix. And I shoot darks at an approximate temperature by simply putting the camera in the fridge) But the temperature of the darks is very important! Differences should be no more than +/- a couple of degrees, and ideally even more precise.
As for a cooled astro camera, I can only dream of one.
9 May, 2026 Reply

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