f Stop calculation

james orme

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Jun 7, 2020

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36

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UK

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Analog

• Jan 16, 2022

• #1

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 !

 

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james orme

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Joined

Jun 7, 2020

Messages

36

Location

UK

Format

Analog

• Jan 16, 2022

• #2

* 21.0 mm lens (artisans ufo lens)

 

Sirius Glass

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Jan 18, 2007

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Southern California

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• Jan 16, 2022

• #3

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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Joined

Jun 7, 2020

Messages

36

Location

UK

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Analog

• Jan 16, 2022

• #4

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