Open star cluster M44 "The Beehive Cluster" or "Praesepe"

 Posted: Dec 29th, 2020
Technical Info
Telescope/Lens: Tamron 70-300mm f/4-5.6
Camera: Nikon D5300
Mount: Фотоштатив QZSD Q999
Software: DSS, FitsWork4, FITStacker13, Gimp, Adobe Photoshop
Exposure:
34 x 5" ISO/Gain: 1600
Orange zoneLight Pollution:
 Ussuriysk, Russia
 Dec 15th, 2020
3 m
2078
The open star cluster M44, also known as the "Beehive Cluster" or "Praesepe" (the Manger). Captured with a Nikon D5300 paired with a Tamron 70-300mm telephoto lens, shooting through a window with a screen. Stacked 34 exposures of 5 seconds each at ISO 1600, aperture at f/4.2. Calibration frames were taken with a full set: 30 darks, 30 biases, and 15 flats. Stacked in DSS. Various corrections for noise, color, and other adjustments were performed in FitsWork4 and FITStacker 13. Masks, levels, curves, and other general corrections were applied in Gimp 2.10.22. Chromatic aberration suppression, saturation adjustment, and final background correction were done in Adobe Photoshop 2021. The imaging was conducted from a yellow-orange light pollution zone on the eastern horizon (the city is located to the west). To the east, the light pollution zones are yellow and green.
Resolution: 3581x2629 px
Scale: 75453 KB
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Comments

Could you please tell me how you performed background correction and reduced chromatic aberration in Photoshop? Is there any tutorial available?
9 Jan, 2022 Reply

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