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Here's an opportunity to get the full version of the Tiffen Dfx Digital Filter Suite for less than 50% off.
You can get it at Adorama for just $29 and to make the deal even sweeter you won't pay a penny for shipping either.
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A complete list of the filters is here, the online manual is here, and video tutorials here.
Below is a demonstration video taped at a trade show, the most impressive thing I saw was at (around) the 3 minute mark where they show the masking capabilities of the Tiffen Dfx Digital Filter Suite and it was pretty darn impressive. Probably the easiest and best masking I have seen, ever!