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Hi Tom
In my experience, find a star that's as close to the same brightness as the ISS/shuttle will be, and use that to focus and set your exposure.
It's difficult during twilight passes to do this, because there's rarely any stars that bright!
Using the Moon to focus is good, but then you still have to get the exposure right.
I always tried to track it, using my finderscope, rather than positioning it where the ISS will pass through and leaving it.
Not sure how many FPS the DSLR does, but I used to use 60fps with the DMK.
Good luck!
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