Nd

T

thisiswells

Retired
I'm more familiar with ND in these terms:
0.3 = 1 stop
0.6 = 2 stops
0.9 = 3 stops

What is the "video" equivalent with terms like:
1/8
1/32
1/64

Is there a direct equivalent? I remember reading something about this a long time ago,
but I don't remember it. I should know this, but the fact is, I don't. Thanks.
 
From Barry's book:

"For those who need to know the exact f-stop difference, it turns out that the ND filters are actually a little stronger than is indicated on the ND filter switch. ND 1/8 is approximately three and 1/3 stops (i.e., an ND 1.0) filter, and ND 1/64 is another four and 1/6 stops, for a total of seven and half stops of ND power."
 
The passage xl70e3 quotes is related to what the actual DVX filters are delivering. But the naming terminology of 1/8 or 1/64, etc., relates to how much the light gets cut down to. So a 1-stop filter cuts the light in half, and could be described as ND 1/2. A 2-stop filter cuts the light to 1/4 its intensity, etc.

So:
ND .3 = 1/2 = 1 stop
ND .6 = 1/4 = 2 stops
ND .9 = 1/8 = 3 stops
etc... i.e., 1/16 = 4 stops, 1/32 = 5 stops, 1/64 = 6 stops.

But, as previously mentioned, the naming seems a little conservative when it comes to the DVX -- the 1/8 is actually about 3.333 stops, and the 1/64 is about 7.5 stops.
 
Yep, there is a about a page worth of ND stuff in your book, so I just didn't feel like typing it all :)

P.S. Oh and thank you for the book, finally got it 2 days ago :thumbsup:
 
ND in camera or on lens?

ND in camera or on lens?

I'm used to film and am more familiar with the ND .3=1stop etc. like in the original post.

I checked at the camera store for ND filters for the dvx100a lens and in the 72mm size they had a 2,4, and a 8.

Could someone help out with the equivalent stop values for those? And if there is a formula for determining this what is it, as in 0.3 of what equals 1 stop.

thanks much!
 
Awesome info

Awesome info

I guess the 2,4 and 8 they showed me at the store was the filter factor then and not the DIN rating. So they do in fact have .3, .6, and .9 for the lens.

thanks much, very helpful!
 
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