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David Callejas

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January 20, 2019

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Paul Macklin
Bloomington, IN USA

11/03/2021
06:00 am

Photographer's Website

Equipment Details:

Scope: William Optics ZenithStar 61ii (61mm APO doublet)
Extra: W.O. Flat61A flattener
Filter: Optolong L-Pro
Camera: asi533mc pro
Guided scope: ZWO 30 mm f/4
Guide cam: asi120mm mini
ZWO ASIAIR plus
ZWO EAF
AstroZap dew heaters
iOptron cem26 mount

Post-processing Details:

Stacked 40 x 3 min exposures using the special "comet" registration mode in Astro Pixel Processor.
30 flats, 30 dark flats, 60 bias frames
(2 hours total integration time)
Auto-tone, Auto-contract, auto-brightness in photoshop
Light denoising in Topaz
Clone/Stamp to remove a few dead pixels missed in this beta algorithm in APP

Image Details:

This is a snapshot of Comet C/2021 A1 (Leonard) on November 3, 2021, taken using a small 60mm APO doublet.

I captured and integrated two 60 minute sequences of 3 minute exposures to show the comet's motion against the star field near URSA Major.

This is my second test on the comet, intended in part to test feasibility for amateur-grade small scopes.

Posted

January 20, 2019

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David Callejas

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About the Author:

David Callejas, Marketing Director, helps bring EarthSky's content to the world via online ads and other products. He creates strategies that help people around the world find us and appreciate the work we do. He helps manage the EarthSky Store and bring to you the new products that you love. He's the chief liaison between EarthSky.org and the world of commerce. All that, plus he helps post content and populate our pages on Facebook, Google+ and Twitter. Go David!