there was an article in Sky & Telescope i read at the ASV library - think it may have been the April issue - there was an article about a home made tracker - other pints the author made were
#tracking will avoid rotation
#he recomedned exp bracketing eg 1/30 - so you get either side of this - depends on camera how many it will do (author used a D700)
#he recommended continuous shooting, so you can just hold the button down or remote & let it fire away at will
#the author used a TV scope as lens , either a 76 or 85 i can't remember
#he was careful to recommend to guard against vibration, either form the scope or whatever else is around - he said it was a big threat to great img's
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