Hi Kirkus
Yes, if the camera is more sensitive it will pick up the faint moons more easily.
With my DMK at the focal length I use, Callisto (the dimmest of the 4) is quite faint but can still be picked up. It's usually lightened a tad in post processing using levels or curves.
Another option for you is to make 2 avi's - 1 correctly exposing Jupiter and 1 where Jupiter is overexposed so you pick up the moon. Process them independently, and make a composite of the two in photoshop or similar.
That's not an uncommon technique.
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