Two ways -

The cheapest IR filter is a fiece of exposed 35mm film.  Just get one of the
negatives from those "scenic lens caps" that people always take, and tell
your photo lab to develop it anyway.  Or just ask them for one- they thrown
them away.

The next level is an actual IR filter from a good phot shop.  These screw
onto a regular camera lens, and are used for taking IR pictures with special
film and a standard camera.  They look coal black, but are IR clear.  ~ $25.

-----Original Message-----
From: Andrew Seddon <seddona@HOTMAIL.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Thursday, June 29, 2000 4:53 AM
Subject: [EE]: Rocket Project


>Hi.
>    Could you tell me where you got that visible light blocking plastic
that
>lets IR thorugh from please? That could come in usefull in what I am about
>to do.
>
>Cheers..
>
>Andrew Seddon