Question about Opteka 500mm f/8 for Canon EOS
The small filters should screw into the back of the lens- also there needs to be one of them on the lens at all times (it's part of the lens design), so there may be a filter already there that needs to be removed before you can put any other in it's place
Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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