ND filter what number to buy
Feb 5, 2012 17:19:30 #
like to buy a nd filter to try out mainly to shoot water to slow it down. ideas please.
Feb 5, 2012 17:20:22 #
In photography, ND filters are quantified by their optical density or equivalently to their f-stop reduction.
ND2 = 1-stop difference = 50% transmission
ND4 = 2-stop difference = 25% transmission
ND8 = 3-stop difference = 12.5% transmission
ND16 = 4-stop difference = 6.25% transmission
Waterfalls (as an example) need at minimum, 1/2-second exposure to show water movement. 1-second or longer, shows more silkiness.
At lowest ISO setting (i.e. 100) at minimal aperture (i.e. f/22), the amount of sun on white water will determine your exposure.
Using an ND2 will double normal exposure time.
Using an ND4 will quadruple normal exposure time.
ND2 = 1-stop difference = 50% transmission
ND4 = 2-stop difference = 25% transmission
ND8 = 3-stop difference = 12.5% transmission
ND16 = 4-stop difference = 6.25% transmission
Waterfalls (as an example) need at minimum, 1/2-second exposure to show water movement. 1-second or longer, shows more silkiness.
At lowest ISO setting (i.e. 100) at minimal aperture (i.e. f/22), the amount of sun on white water will determine your exposure.
Using an ND2 will double normal exposure time.
Using an ND4 will quadruple normal exposure time.
Feb 5, 2012 17:30:12 #
Feb 5, 2012 17:44:23 #
Feb 5, 2012 17:45:57 #
Feb 5, 2012 18:21:29 #
Feb 5, 2012 18:39:45 #
snowbear wrote:
Start with a 4
When I bought mine, I guessed and bought 4. No complaints.
Feb 5, 2012 23:56:03 #
Feb 6, 2012 07:14:45 #
Erv wrote:
And if you get a 2 and a 4 you can stack them and get a 6 at no charge.
Erv
Erv
Speaking of 2 & 4, we all know that H2O is water. What is H2O4?
(washing, drinking, cleaning, etc)
Feb 6, 2012 07:23:57 #
jerryc41 wrote:
Speaking of 2 & 4, we all know that H2O is water. What is H2O4?
(washing, drinking, cleaning, etc)
Erv wrote:
And if you get a 2 and a 4 you can stack them and get a 6 at no charge.
Erv
Erv
Speaking of 2 & 4, we all know that H2O is water. What is H2O4?
(washing, drinking, cleaning, etc)
:shock: :-D
Erv
Feb 6, 2012 08:02:57 #
You might want to consider a variable ND filter. It covers all the bases. I bought one for the same reason (slow down water) and find that I can vary the density for each situation just by twisting the ring on the filer. :P
Feb 6, 2012 09:16:12 #
Feb 6, 2012 10:28:30 #
I found myself limited with a #4 - finally bought the variable and been happy sense. Cost more. You need good glass as well, B&W
Feb 6, 2012 11:34:56 #
ronjay wrote:
Thanks everyone i think i will either buy a 2&4 or a variable nd filter.
Consider this option. 1- ND-2, and 1-CP-2 (Circular Polarize); the ND filter can be coupled with the CP to give you both the reduction you need for flowing water, and blocking of reflections in the water. You can use either, or both for desired effect.
Michael G
Feb 6, 2012 11:58:17 #
vciro wrote:
You might want to consider a variable ND filter. It covers all the bases. I bought one for the same reason (slow down water) and find that I can vary the density for each situation just by twisting the ring on the filer. :P
The VND is a great choice I like mine. You are not screwing filters on and off all the time. I have 2, 4, 8 ND's also (they do not make a 6--they make a .6 which is same as 4).
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