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I have investigated the gap left my the ill fitting gasket and it apparently is a known manufacturing problem and now all new Hitech ND 10 stop filters are to be supplied with a modification to the gasket. Unfortunately it is not retrospective so all previous buyers like me will not be given any help from Hitech. Fortunately my supplier is hoping to build something using the gasket foam used by Hitech to make a better seal with the lens so I shall post back with any results.
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