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ND filters
417 5 2017-2-13
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Jflood
lvl.1

Ireland
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Going to buy some ND filters thinking of buy 3. N3 N4 N16
Is there a formula to set shutters speeds. ?

Thanks for help
2017-2-13
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Cabansail
Second Officer
Flight distance : 136686 ft

Australia
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ND Filters will reduce the light by dividing it by the number on the filter.

ND2 = 1/2
ND4 = 1/4
ND16 = 1/16

Each time you reduce the light by a half that is referred to as  1 Stop.

If the shutter speed is 1/500th without a filter then it will become;

ND2  - 1/250th
ND4 - 1/125th
ND16 - 1/60th
Changing from 1/500th to 1/60th is a variation of 3 stops.
2017-2-13
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samuraiz
lvl.4
Flight distance : 202585 ft
United States
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In a nut shell,  most video is shot using the the reciprocal of twice the frame rate to achieve pleasant motion blur that most are accustomed to see in movies and video.   So if you are shooting a frame rate of 30FPS use a shutter speed of 1/60,   60 FPS   - 1/120  I see you are in Ireland so most likely you will be shooting PAL so @ 25FPS -1/50 or 1/60  etc.    Most find that in the early morning and late afternoon ND8 works middle of a sunny day ND16.      However it takes a bit of experimentation.      Put on a filter.   Raise the Phantom up about 10 meters and point the camera in the general area that you are interested in.   adjust the camera parameters to provide a centered histogram with the Shutter speed at the above mentioned numbers and the ISO at 100 or 200.   If it's overexposed use a darker filter.  IF you have to set the ISO above 200 change to a lighter filter.  
2017-2-13
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WYHSniper1007
Second Officer
Flight distance : 1003822 ft
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United States
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There will be a formula that said reduce the light
2017-2-13
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Barney2k
Second Officer
United Kingdom
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I always reference this post when I'm querying ND filters.

Seems to contain all the necessary info.
2017-2-14
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Jflood
lvl.1

Ireland
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That's great lads.
2017-2-17
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