I would like to know the exact UTC time for the moment the trigger is pressed. A millisecond accuracy would be ideal, but anything better than 1 second is acceptable.
The details of the photo properties are not accurate enough. The reported time is at best in UTC minutes.
Is there a delay between clicking the shutter button and opening the shutter button? Yes obviously, but how much? and does it depend on the shutter speed and something else?
I launch satellite passes in the night sky, with the ultimate goal of orbit determination. Precision is very important!