The Pinwheel Galaxy 21 million light years away in Ursa Major. And many more galaxies in the background.

Acquisition Details

Scope: Borg 90FL/500 with 1.08x Flattener
Filter: None
Camera: ZWO ASI 2600MC Pro
Mount: Skywatcher HEQ5 Pro
Guiding Scope: MiniBorg 50
Guiding Camera: ZWO ASI 290MM
Guiding Software: PHD2
Acquisition Software: APT
Light Frames: 35x180sec
Flats, Dark Flats, Bias, Darks
Camera settings: Gain 100, Offset 20
Half moon
Bortle 4-5
Acquisition Date: Mar 23, 2021

Processing

Stacking Software: DSS
Imaging: PixInsight

Here a few more versions. The first is simply uncropped and with some sort of star reduction.

In the following I have annotated quite a few of the background galaxies.