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Old 11-03-2011, 04:45 PM
AstroGuy
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AstroGuy is offline
 
Join Date: Mar 2011
Posts: 179
Astronomik Filter Specs

Photographic OIII
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http://www.astronomik.com/en/astrono...cd_filter.html

Visual OIII filter
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http://www.astronomik.com/en/astrono...ii_filter.html


It's still possible you may be using the wrong one NeilW. Does it say anything on the filter housing?
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