ND filter stops?

[wonderwall]

How much light do the DVX ND filters take away, in terms of stops? It's 1/8th and 1/64th of what?

 

[oneinfiniteloop]

I think it's 3 and 6 respectively.

Correct me if I'm wrong

 

[Petrus]

powers of 2: 2x2x2=8 (3 stops) 2x2x2x2x2x2=64 (6 stops). Photo math is relatively easy.

 

[MRFilm]

Or if the math above gives you a headache. . . ;-)

everytime you "ND" down 1 stop you reduce the amount of light by 1/2.

so: 1 stop= 1/2, another stop= 1/4 and another stop= 1/8, to end up at 3 stops

and when you continue this 3 more times = 6 stops

However it's easier to think about.
Above is the way I could get my other (old film guy friends) on the right page. Since we were always dealing with ND.3, .6, .9, 1.2, etc. . . filters

They were shocked (pleasantly) at how much the second filter reduced the light.

MR

 

[CineAlta]

See p. 118-119 of Barry Green's "The DVX Book," (Fiercely Independent Films, Las Vegas).