Hi yang, thanks for the information. I don't have a 120MM-S, just considering returning my AS120MM (USB2.0) for an upgrade to USB3.
Can I ask which distro/version have you installed on the Pi3 (Ubuntu MATE 16.04, Debian Jessie, etc)?
Did you have it running for several hours of continuous shooting? I plan to use it as guiding camera.
Thinking in planetary imaging, how many fps do you get?
Thanks!!