Thread: 12th July Sol good seeing.
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  #6  
Old 12-07-2013, 06:53 PM
George Ionas
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George Ionas is offline 		 
Join Date: Apr 2010
Location: New Zealand
Posts: 234
John, I use a straight through BF30 so the image is not reversed, but most people use the BF filter incorporated into the diagonal I suppose it's used for comfort for visual observing.
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