By how much does an ND8 (Neutral Density) filter reduce your shutterspeed? Does an ND filter cause any exposure metre errors?
by 
Jimmyz101
ANSWERS: 1
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ND2 ..... 1 stop. ND4 ..... 2 stops. ND8 ..... 3 stops. Neutral-density filters are designed so as to prevent exposure errors, providing the light meter you are using is properly calibrated and you are using a good-quality filter.
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