like to buy a nd filter to try out mainly to shoot water to slow it down. ideas please.
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.
looking for a number 2-4-6-8-???????????? somewhere to start
Heck, get a 4 and a 2 - they don't cost all that much.
thanks much for your info ron
snowbear wrote:
Start with a 4
When I bought mine, I guessed and bought 4. No complaints.
Erv
Loc: Medina Ohio
And if you get a 2 and a 4 you can stack them and get a 6 at no charge.
Erv
Erv wrote:
And if you get a 2 and a 4 you can stack them and get a 6 at no charge.
Erv
Speaking of 2 & 4, we all know that H2O is water. What is H2O4?
(washing, drinking, cleaning, etc)
vciro
Loc: Wantagh, Long Island, NY
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
Thanks everyone i think i will either buy a 2&4 or a variable nd filter.
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
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
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).
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.