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Old 29-12-2018, 11:16 AM
Huey (Michael)
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Huey is offline
 
Join Date: Mar 2009
Location: Cobar
Posts: 117
Obstruction

Since it has something to do with the optics I'd guess it refers to the central obstruction of a SCT or Mak. Yours is a refractor and does not have an obstruction. Nothing to worry about. Enter 00 if you can.

Hope this helps.

Huey
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