This image of M51 was taken over a period of about 4 years. My first image ever taken was of this galaxy and recently I decided to shoot it again. All data from the last 4 years, taken with a C11, Skywatcher ED80, Robtics ED110 and TEC140 were combined to get this result.

Further more rgb-data from Michael van Doorn (dutchastrocolors.com) with his Hyperstar C11, was integrated to get a nice color view.

Total exposure time was 17 hours, consisting of 110 images of 300 and 600s taken during the past 4 years.

This shows a comparison with my earlier processing:

And here is the final result:

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