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Old 29-04-2019, 11:24 AM
Wavytone
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Wavytone is offline
 
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Actually you do, to some extent - because tracking errors in R.A. mean the field rotates. If the scope were centred on dec -90, the resulting image could look like it had astigmatism. However for that to be evident the errors would need to be pretty gross.
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