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ND filter confuses light meter?

TomHackettPhoto

Kingston, US
23 posts

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TomHackettPhoto Silver Member Nikonian since 21st Apr 2012
Mon 16-Sep-13 12:10 AM

I have a 6-stop neutral density filter (uniform density, not graduated) that I have been using with my D800E and AF Nikkor 24-85mm 1:2.8-4 D lens.

Comparing the meter reading (in A mode) with and without the filter, I get a difference of about 6 stops (e.g. 1/125 sec. without, 1/1.6 sec. with, both at f/5.6). But while the 1/125 sec. exposure without the filter appears correct, the 1/1.6 exposure is very dark. Exposing for 15 sec. at f/5.6 (in M mode) gives me a pleasing result, although the light meter thinks this is much too long.

I've heard that a linear polarizer can fool a light meter, but can a ND filter do so as well? Has anyone seen this phenomenon before?

I guess I should experiment with other lenses/bodies. If I do, I'll report the results.

Tom

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