The Filters We Need With Digital...

Started Oct 5, 2008 | Discussions thread
JensR Forum Pro • Posts: 17,694
Re: Or two of them...

Hi Boris!

And usual crossed polarisers act as a defacto IR pass filter

I knew this applied to gel filters, but thought the ones made out of
glass weren't IR-transparent. Good to know, thank you!

Here's how I found out
http://www.jr-worldwi.de/photo/polarizer.html
It is not very technical, but the pics and data should be okay.

If you research in a catalogue for optical componets (Edmond Optics for example), you will see that polarisers that really work in IR cost quite a lot.
I assume this has both technical reasons and economy of s(c)ale ones.

Cheers
Jens

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'Well, 'Zooming with your feet' is usually a stupid thing as zoom rings are designed for hands.' (Me, 2006)
My Homepage: http://www.JensRoesner.de

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