f Stop calculation

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james orme

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Can some one let me know how many stops this is please:

1. ND filter 10 (I think) it's a GOBE ND512 + 1/4000 second + ISO 100 + 0 ev
2. the same but with -2ev

Many thanks in advance !
 

Sirius Glass

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I would think it is 10 f/stops wider open or longer exposure or combination of the two for starters. What does specification say?
 
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james orme

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Thanks- I'm not sure but imagine that it must be about 24 stops or higher (shooting at 1/4000 sec)
 
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