Just tested my new Vari-N-DUO Thin from Singh Ray.. has the Variable ND 2-8 stops AND a circualr Polarizre built in. NO vignetting at 11mm on my Tokina 11-16mm nikon mounted lens. Amazing. I will post creative test videos soon.
Amazing really. I use it all the time outside. Lets me have shallow depth of field and cut down on unwanted reflections such as leaves and helps bring backs sky blues. Much more filmic look.
example of something I shot:
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