Re: polarizing filters with b&w infrared

[tom@xxxxxxxxxxxxxxxxxxxxxx (Tom Benedict)]

>> So has anyone tried an IR polarizer?  They're there (at least you can
>> order them from optics houses like Newport, Melles-Griot, and Oriel).
>> Has anyone tried using them?  They'd be linear polarizers, but I doubt
>> anyone is using autofocus for HIE anyway (or did I just put a really big
>> foot in my mouth? ;) )
>
>First, like Joe said, polarizers indeed loose their effect beyond 
>750-800nm. Actually, you can create a rather dark IR filter by cross 
>polarizing two pol's. Near-IR is unaffected, yet visible is blocked.

Normal dichro sheet polarizers, yes, but there are other kinds of
polarizers, some of which work phenomenally well in the near IR.