Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5447  ·  NGC 5449  ·  NGC 5450  ·  NGC 5451  ·  NGC 5453  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5462  ·  NGC 5471  ·  NGC 5477  ·  Pinwheel galaxy
M101 - The Pinwheel Galaxy, Will Czaja
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M101 - The Pinwheel Galaxy

M101 - The Pinwheel Galaxy, Will Czaja
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M101 - The Pinwheel Galaxy

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Description

Ha+LGRB data using Chroma filters.

It's galaxy season! This is a close crop of M101 from a much larger full frame image I took. I'll soon be setting up a new scope (EdgeHD 11") dedicated to shooting galaxies. But I think the little FSQ-106 did a fine job none the less!

I discovered an excellent tutorial by Adam Block on preserving strong color data without resorting to boosting saturation post historgram transformation. He uses a slight contrast boost to the linear RGB data and then the ArcsinhStretch tool to stretch the RGB image before combining with the L data. He also stressed the importance of keeping the L data below a K value of 0.8. I used this technique while processing this M101 image and I think it turned out much better than my first pass using my typical stretching and saturation technique.

Here's Adam's tutorial on the Astro Imaging Channel:

https://www.youtube.com/watch?v=quIfw1nTt_E

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M101 - The Pinwheel Galaxy, Will Czaja

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