3248 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.

N.I.N.A. is working beautifully with my Skywatcher, and the hard part now is working out which targets to image!

Sombrero Galaxy

The Sombrero Galaxy (also known as Messier Object 104, M104 or NGC 4594) is a peculiar galaxy of unclear classification in the constellation borders of Virgo and Corvus, being about 31.1 million light-years from the Milky Way galaxy. It has a diameter of approximately 94,900 to 105,000 light-years, making it slightly bigger in size than the Milky Way.

It has a bright nucleus, an unusually large central bulge, and a prominent dust lane in its outer disk, which is viewed almost edge-on. The dark dust lane and the bulge give it the appearance of a sombrero hat (thus the name). Astronomers initially thought the halo was small and light, indicative of a spiral galaxy; but the Spitzer Space Telescope found that the dust ring was larger and more massive than previously thought, indicative of a giant elliptical galaxy.

The Sombrero Galaxy was discovered on May 11, 1781 by Pierre Méchain, who described the object in a May 1783 letter to J. Bernoulli that was later published in the Berliner Astronomisches Jahrbuch. Charles Messier made a hand-written note about this and five other objects (now collectively recognized as M104 – M109) to his personal list of objects now known as the Messier Catalogue, but it was not "officially" included until 1921. William Herschel independently discovered the object in 1784 and additionally noted the presence of a "dark stratum" in the galaxy's disc, what is now called a dust lane.

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