Thread: double spikes....why?
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  #22  
Old 01-03-2011, 04:28 PM
solissydney (Ken)
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solissydney is offline 		 
Join Date: Mar 2006
Location: Castle Hill Sydney
Posts: 660
Trevor, double lined spikes indicate an out of focus image. I use a feeler gauge to check the focus on my 12 inch F/5 Newt.. One quarter of one mm makes a visual difference
Ken
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