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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

n

a short primer on calibration frames

Community Work

Community Work

Common Image Capture Problems

NGC 246
Common problems with image capture as seen with how the stars look in the image
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Setting Telescope Back Focus

NGC 7814
Setting your telescope's back focal distance
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The Impact of Target Altitude

Sculptor Galaxy
The impact of target altitude on imaging
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Tips for Climbing the Astrophotography Learning Curve

Messier 77
Astrophotography Tips
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