Quote:
Originally Posted by Steve_C
How accurate does the curved rod need to be? I have bent it as close as I can to the correct radius for an M6 rod, 9".
How accurate does the measurement from the hinge to the rod need to be? within 1mm, .5, 2?
steve
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Hi Steve,
A 1mm error in the radius, that is where the radius error results in a 1mm greater radius than the ideal radius will result in a drive rate error of 4 arc sec per minute. This is not significant for short exposures on wide angle lenses. Up to 2 min exposures up to 100mm lenses. Accurate polar alignment will present a bigger problem than this error.
Cheers
Joe