Why no digital ISO50 ?

Started Nov 17, 2012 | Discussions thread
Gordon W
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Re: Variable ND Filter
In reply to Mark_A, Nov 18, 2012

Mark_A wrote:

Hi Gordon,

Thanks for that link, they could be interesting for me. Ideally I would be able to get a cokin P type version or is rotating required to make it work I wonder.

Yes, they require rotating, just like a polarizer. In fact, that is what they are but made by sandwiching two polarizing elements, one stationary and the outer one that rotates, which is what changes the density, whereas rotating a single element polarizer just removes glare.

I've never used Cokin filters so don't know anything about them.

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Regards, Gordon
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