polaroid polarizer sheet?

[Antonio Corcuera]

hello,
I have been given a lot of Polaroid linear polarizer (grade HN38), in thin 4x4" sheets. I believe they are optically OK, but has anyone tried this in front of the lens? What about compensation?

[Bob Salomon]

Try it. Most likely they are for lighting or other purposes then in front of the lens.

[Wayne_6692]

Here's a link.

http://www.apioptics.com/linear1.htm

Considering that polarizers are somewhat precise in their manufacture compared to other plastic-based filters I would be surprised if a thin-stock polarizer (on the order of 6-10 mil) was not flat enough optically to be of no significant impact. Especially on large format.