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What is the Full Width at Half Maximum (FWHM) and why is it so important?

There is a measure in astronomy that is called full width at half maximum (FWHM).

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Dynamic Narrowband combinations with Pixelmath

Messier 109

Telescope Focal Ratio Explained

Community Work

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PixInsight Copy Coordinates Script

NGC 2077 Telescope Live
How to use the PixInsight Copy Coordinates Script
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PixInsight SPCC for Narrowband Images

RCW 85
How to use SPCC for narrowband images
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Using a CMOS Camera

Messier 65
Discussion of CMOS vs CCD cameras
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Understanding Image Stacking

Seagull Nebula SHO
The basics of stacking astro image sub exposures to create a single image.
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The Barnard Astronomical Catalogue

Barnard 228
Discussion and history of the Barnard Catalogue.
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The Primary Astronomical Catalogs

Crab Nebula
Understanding the origins of the NGC and IC astronomical catalogs.
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