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Super Nooby Question - Dob Dust Cap
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02-05-2010, 04:08 PM
DavidU
(Dave)
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Join Date: Jul 2007
Location: melbourne
Posts: 4,835
Caps with 2 holes are used for focusing
http://www.billyard-ink.com/Hartmann.shtml
Caps with one larger hole off set from the centre is to stop down a scopes aperture (ie: turning a 12" f5 into a 6" f12).
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