purpose of Gradual-color Gray filter ?


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spitfire

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Oct 27, 2002
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I've a Hoya Gradual-Color gray filter.
May I know whats the purpose of it ?

Issit to tone the sky (from over exposure) as there is a greyish tint on 1 half of the filter ?

And is this Gradual functions as ND filter ? ( a bit confused) coz the seller told me its an ND filter initially. So I was wondering if it can acheive those nice silky waterfall effect. :dunno:

Thx.
 

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