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Old 22nd February 2014, 03:34 PM
Collas Collas is offline
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Join Date: Dec 2010
Posts: 971
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Tiffen do them.

http://www.tiffen.com/results.html?s...lename=filters


Formatt do them.

https://www.formatt-hitech.com/en/pr...rature~97.html


Lee do them.

http://www.leefilters.com/index.php/...ur-temperature


Schneider do them.

http://www.schneideroptics.com/pdfs/...terBooklet.pdf



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