1040 seconds of 8 second lights

Skywatcher 350 goto, ZWO ASI2600MC PRO (cooled to -15c), Starizona Nexus focal reducer, and ZWO Duo-Band filter.
Telescope and camera controlled by N.I.N.A.
30 2.0 second flats, 27 4.0 second darks, and 30 0.1 second biases.
Gain set to 300 for lights, darks and flats, and 1 for biases.
Binning set to 2x2.
Flats taken using a white T-Shirt stretched over the front of the telescope and exposed to the light from my storage shed.
No moon, Bortle 5 skies.

I went through the Lights in ASIFitsView and deleted the images that had been affected by the occasional gust of wind shaking the telescope, stacked and processed the images on a PC in Siril, and then transferred to a Mac and ran them through Starnet++, and Affinity Photo 2 (with RC-Astro's NoiseXterminator plugin).

Messier 4

Messier 4 or M4 was discovered by Philippe Loys de Chéseaux in 1745 and catalogued by Charles Messier in 1764, It was the first globular cluster in which individual stars were resolved.

M4 is conspicuous in even the smallest of telescopes as a fuzzy ball of light. It appears about the same size as the Moon in the sky. It is one of the easiest globular clusters to find, being located only 1.3 degrees west of the bright star Antares, with both objects being visible in a wide-field telescope. Modestly sized telescopes will begin to resolve individual stars, of which the brightest in M4 are of apparent magnitude 10.8.

M4 is a rather loosely concentrated cluster of class IX and measures 75 light-years across. It features a characteristic "bar" structure across its core, visible to moderate sized telescopes. The structure consists of 11th-magnitude stars and is approximately 2.5' long and was first noted by William Herschel in 1783. At least 43 variable stars have been observed within M4.

M4 is approximately 6,000 light-years away, making it the closest globular cluster to the Solar System. It has an estimated age of 12.2 billion years.

(Adapted from https://en.wikipedia.org/wiki/Messier_4)