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I do not have any neutral density filters, so I would like to do the testing by closing the diaphragm instead of adding the filters, is this possible? I figure a .1 ND filter filter is 1/3 of a stop, so I would do the 10 sec exposure at 22 1/3, the 100 sec exposure at 22 2/3, the 1000 at 32 and the 10000 at 32 1/3. Is this Kosher?
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