M101 - 20220527 - Evoguide 50ED - IR642 (altazastro)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5422 · NGC 5457 · NGC 5461 · NGC 5473 · NGC 5474 · NGC 5485

M101 - 20220527 - Evoguide 50ED - IR642, altazastro

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M101 - 20220527 - Evoguide 50ED - IR642

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M101 - 20220527 - Evoguide 50ED - IR642

Another experiment with the Astronomik IR PASS 642 filter on a galaxy.
Thanks to the moon phase and the rather clear sky the result was reasonably good, but there were a couple of issues with the setup chosen.
One is the small aperture of the Skywatcher SW 50ED, which, particularly when paired with a limited bandpass filter (642-842 nm in this case) would require longer integration times to give fully satisfactory results.
Another is the pairing of the aforementioned telescope with the Starizona flattener and the ZWO ASI 183MM, which is more critical than with longer focal length telescopes (like the TS 72/432) and may produce irregularly shaped (even rather square) stars, so much so that I have to bin 2x2 after acquisition and also to go rather "heavy handed" on star shapes in postprocessing.

Broadband under Bortle 7/8/9

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M101 - 20220527 - Evoguide 50ED - IR642

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M101 - 20220527 - Evoguide 50ED - IR642

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