Nice framing. I need to be able to make it out more as I've gone after it with dual 50s and the equatorial (running the k500 and K-3ii at the same time). I will get them framed up and let the cameras roll continuously until I pack up and leave or until the batteries dies. I've done the once this year and have run only a single 50 once as well. However I still want to make it out at least a couple more times.
With the 50/1.4 lenses I've always like the results at f/2.8 better than f/2 for astro, and even the 50/1.2 I will run at I think f/2.4 (the click between 2 and 2.8)
There is a lot of dust in that area so it might not be gradient. My dream shot that I am hoping to maybe be able to some what replicate
is this one. Hence dual 50s to get as many shots as possible.