ND8 Filter

M

Mike_E

Well-known member
I'm thinking about getting an ND8 filter, and I've found one, but I think it could be for a still camera. Would it still work the same, or do I need one made for video cameras?

Thanks,
Mike
 
Re: ND8 Filter

Thanks for the super quick response. When you say a bit dark, do you mean that it's darker on the video camera or just commenting on the ND8 filter itself?
 
Re: ND8 Filter

Well both really.

While you'll be able to open the lens more, you'll need a rather brightly lighted shoot.

A good filter, but you'll have to be carefull about underexposing.
 
Re: ND8 Filter

As everyone may know, but just in case, in the still photography world they tend to classify ND filters strength by the exposure factor rather than the actual density of the filter so the one stop ND .3 from the film and video world is a 2x, the 2 stop ND .6 is a 4X and the 3 stop ND .9 is an 8X.

As long as the filter is of good optical quality there is no difference, just marked differently.

Bill Turner
Century Division
Schneider Optics
 
Re: ND8 Filter

Ok. So is the ND8 8X? Or is it ND .8 which, as stated, is .9? Or none of the above - ???
I've never been much good with numbers - sorry..
 
Re: ND8 Filter

it is an 8X ND filter which has a density of 0.9 that results in a 3 stops loss-- you have to open the iris 3 full stops (e.g. if you were at f 11 and added the 8X filter you would open up to f 4 - f8= 1 stop, f5.6 = 2 stops , f4 = 3 stops-- to return to the same image brightness)

Hope this helps

Bill Turner
 
Re: ND8 Filter

I never understood this 0.3, 0.6, etc, but when I saw your explanation, it struck me that it actually looks like a logarithmic scale.

So - and I am sorry if it's too 'scientific' - for a lot of things I need a math relationship to start to understand.

My question is: Is the relationship between 'still' ND and 'film' ND something like this:

filmND = log (stillND, 10)

or, in an inverse function

stillND = 10 ^ filmND

???
 
Re: ND8 Filter

Jerry you're a MADMAN! haha, I'm just jealous because I'm not good at science. ;D
 
Re: ND8 Filter

FlatEric, you're assuming of course that all of Jerry's hieroglyphics actually mean something, after all......who'd know..... :-/


LOL Jerry
 
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