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Choosing Filters


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#1 Alex James

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Posted 16 August 2012 - 07:03 AM

Hi Guys,

Another question. I am using matte boxes and 4x4filters.

How do you guys get the right filtration say I need an nd.2 for this scene.

Do you spot meter? or Just get an average?

So how do you choose your filters?

Thanks
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#2 Adrian Sierkowski

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Posted 16 August 2012 - 07:14 AM

Well with ND it's kinda simple. If you're outside, let's say, and you're at a F5.6 and you want to be at an F4 (for focus reasons) you grab an ND.3
It works on base 3 so .3 is 1 stop .6 is 2, .9 is 3 1.2 4 ect....
Now, if you're talking about how you know how much to bring it down in the first place, yes, you'd wanna meter. Spot or incident is fine-- depending on what you're metering. Or, conversely, you can often just look at the image if on video.
Of course you have to actually know how to use a light meter before you can really do any of this (and you'd be surprised how many people don't seem to understand how to use a light meter these days...)

After awhile you'll know how much to bring things down through experience. For example; I've screwwed up plenty with ND grads and the sky so I know that, really, I don't often want to go above a .9 ND grad (and normally stick to about a .6)
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