Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  M 13  ·  NGC 6205  ·  NGC 6207
M13, Fred J Keller
M13
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M13

M13, Fred J Keller
M13
Powered byPixInsight

M13

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Description

This is an image I took to verify the operation of N.I.N.A's (Night Time Imaging "N" Astronomy) autofocus routine. I like to use M13 for autofocus testing. There is an interesting story why I use M13 .

When I first started astrophotography I proudly sent one of my first images to a good friend and experienced astrophotographer. He quickly returned my email with a detailed critique which started out "Your image is out of focus". He attached one of his images of M13 for comparison. After I examined his image I realized that I had a lot to learn about focusing my images. He steered me to a guide on how to use a Bahtinov mask. That was extremely valuable advice even though it was embarrassing and painful at the time.

I am still learning to process my images. However, thanks to a vast number of YouTube videos I am starting to gain a basic understanding of PixInsight.

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M13, Fred J Keller