I have a ZWO 294MM that I use for galaxies and a ZWO 294MC for nebulae. I have been picking which camera I want to use for the night and sticking with that. I do not like to switch while viewing because that requires capturing new flats. I have a light panel, so doing flats is not that bad but it still takes about 10 minutes to switch cameras, capture flats and focus. Because of this, I only do it once at most.
I recently saw the Baader FlipMirror II Star Diagonal and thought about attaching both cameras on that. I attach the camera that I plan to use the most for the night on the straight path. Then the other camera on top. I know that adding more glass to the light path is non-optimal, but this is for EAA so I am not looking for the perfect image. I still can get a backfocus of 105mm.
I can capture flats before the night starts and then switch between them. This assumes that the flip mirror position is the same each time for the flats. Now if I wanted to switch cameras, all I need to do is flip the mirror and then focus using my focus motor. I think, this should only take about a minute and would be easy to do. Doing this a couple times a night would not be a big deal. Especially once I have the focus motor position for each camera.
Thoughts on this idea?