Only 30 minutes of exposure for this test image of the Andromeda Galaxy (M31) with a TPO 180mm F/4.5 Ultrawide Astrophotography Lens. Askar is the OEM and the lens is a small APO triplet with 40mm objective that has 2 elements of FPL-53 glass and includes a triplet reducer/flattener, making it a sextuplet full-frame astrograph. The spot diagram for this lens shows that it doesn’t quite produce perfectly round star images, however, even at the center. But, some of that is correctable during post-processing and the lens produces a pretty flat image regardless.
I also did 70×3 min subs for the Veil Complex that I took before the M31 set. That turned out like this:
Here is a lighter version: