Thread: More Focal Lenght.
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Old 20-08-2010, 12:50 AM
riklaunim
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riklaunim is offline 		 
Join Date: Apr 2010
Location: Poland
Posts: 74
You can also use good/high quality barlow like GSO 2.5x APO or achromatic mixed 1.5/2x GSO. There are also good 2" 2x GSO and SkyWatcher APO Barlows.
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