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David Callejas

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January 20, 2019

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Randall Kayfes
Tucson, Arizona, USA

11/11/2022
10:24 am

Photographer's Website

Equipment Details:

Celestron 9.25 2350mm, SCT, OTA, Meade FR/Flatner .63 ZWO ASI533 MC Pro cooled to 0°C
Coronado 40mm Hydrogen-Alpha Single Pass filtered, ZWO ASI 290 MM

Post-processing Details:

SharpCap, Autostakkert evaluative stacking performed, Registax sharpening, DarkTable for contrast and color refinement.

Image Details:

Left: White Light Filtered 0.01%, Right Hydrogen-Alpha Single Pass Filtered. Sunspots 3145, 3140 and 3141 continue to showoff both in white and Hydrogen-Alpha spectrums.

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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!