Quote:
Originally Posted by alistairsam
when you say less than 1 arcsec resolution is needed, did you mean when measured at the motor end or the output shaft end
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Shaft end I meant.. because average camera scale will be close to 1 arcsec/pixel (1m FL, 5um pixel).
I am aware of those closed-loop systems, but they must be extremely expensive (encoder must be free of PE and backlash, which is not possible to achieve (at reasonable price) with up-gearing)- so I don't think they will ever be available for average user.
And what's the point? Guiding works well (not my own experience yet, though).