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Old 09-09-2011, 10:22 AM
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bojan
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Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 7,112
Well, <1arcsec must come with a (high) price.
As discussed in other threads, the high resolution/high precision encoders used to obtain such an impressive tracking accuracy and low PE are very expensive items.
Also, the atmospheric refraction is not to be forgotten as a factor contributing to tracking errors.. and it can't be taken out of the way with encoders.
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