Re: Infrared-Digest V #32

[Gary Beasley <beasleyglb@xxxxxxxxxxxxxx>]

>Date: Mon, 10 Jan 2000 15:02:01 -0800
>From: Andrew Frazer <Andy.Frazer@xxxxxxx>
>Subject: Backplate windows?
>
>I just started using a new Olympus OM-2000 for my HIE
>work.  I haven't finished the first roll yet, but I'm
>worried about the little see-through window on the
>backplate of the camera.  This window is a narrow slit
>that lets you read the ISO rating directly off the 
>film canister.  Obviously it's going to let in IR light.
>I've covered it up with black electrical tape.  I haven't
>seen the results yet, but I hope the electrical tape
>will prevent the film from fogging.
>
>Now, I know other camera bodies have similar windows on the
>backplate.  Has anyone had any experience covering these
>windows up?  Does electrical tape work?
>
>
>Thanks in advance,
>
>Andy Frazer						     
Actually many brands of electrical tape is transparent to infrared. I built
an infrared meter once and used a piece of black electrical tape as the
visible light blocking filter.
This is because of using dyes instead of carbon black to make the tape
black. If you really did have a problem with IR leakage I would recommend a
metal foil tape ( or even muffler tape!) to block the IR if you couldn't
find a really BLACK tape. One way to check would be with an IR sensitive
ccd camera and see how dark the tape looks with light behind it.
Gary Beasley
http://beasleyglb.home.mindspring.com/

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