Calumet's CP's

[frank]

Anyone been using Calumet's 77mm Circular Polarizer MC ?
Has anyone had any experience of them and would care to comment. Thanks

[AliB]

I've got one of theirs on a 24-105mm on my 5D and found it more than satisfactory. Took a few pics in the snow at Easter and the skies came out a nice punchy blue against the white snow. Worked a treat.