Thread: Suck or Blow?
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Old 11-10-2012, 01:46 PM
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asimov (John)
Planet photographer

asimov is offline 		 
Join Date: May 2005
Location: Bundaberg
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By sucking air down the OTA you set up a cyclonic effect: The column of air in the OTA starts to spin (nature of a fan) & induces some not nice viewing/imaging 'opportunities'..Don't do it
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