[LargeFormat] Re: Center filters vs Gray grads vs. Neutral density filters for 4x5

[Dave Mueller]

It's the COS^4 law.

Dave

Frank Filippone wrote:

> My memory is the the lenses drop off at the power of the third law.... or
> maybe square.. anyway, that is the opposite of the filter.....
>
> Frank Filippone
> red735i@earthlink.net
>
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