Originally Posted by
Ted R
Perhaps you are already aware of this, and perhaps this has been covered already however I didn't see it.
High value ND filters show a problem when used with digital cameras, the filter performs as expected in the visible range but not beyond the visible range at both ends there is significant leakage. Unwanted and unpredictable color shifts occur due to sensor sensitivity beyond the visual range, especially the infra-red, unless additional band-stop filters are added. Filter maker BW makes a statement about this on their website, in the detail spec for filter families. In your film application there may be a similar effect. Might be a good idea to test for this.
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