This is a checkpoint summary of my progress in shooting ISS, there are 5 attempts so far.

Scope: Sky-watcher 14" Synscan Dobsonian (manual hand tracking)

Camera and Barlow: Player-One Apollo-M Max (3rd,4th,5th) with Televue 3X Barlow; Player-One Mars-C (1st, 2nd)

For the 5th attempt:
Exposure time 0.5ms, Gain 210.
Altitude of ISS: 87 degrees
Distance from ground: 423km
Orbital Speed: 27,000 km/h
Brightness: -3.9