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From: Thomas Shaddack <tsc..._at_shaddack.mauriceward.com>
To: tscm-l2006_at_googlegroups.com
Subject: Re: [TSCM-L] {4921} Bug Off - 20 page free debugging manual
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A thought.
Cameras may be "hardened" against the SpyFinder tool with a piece of a
circular polarizer foil; it filters a polarized light, and twists its
polarization (I'd have to look up the theory). The result is that light
can pass through one way, but light trying to pass through, reflect, and
return back through is absorbed by the polarization filter. (For one-pass=
transmitted light the filter acts just as a normal linear polarization
filter; for two-pass transmission of a reflected light the filter absorbs=
the reflected light, as the two passes of light through the twisting layer=
turns the polarization angle by 90 degrees, for which the linear
polarization filter is opaque.)
The circular polarizing filters could be obtained for photography
(high-cost,high-quality) or in the form of a plastic foil (relatively
cheap, especially given that the amount needed for a small lens is rather=
minuscule). The foils are used on some LED displays in order to increase
the contrast; only the light from the LEDs gets through, ambient light
reflected from the display face gets absorbed by the foil on its way back.
More theory here, including a photo of such filter effect on reflected
light:
http://lenstip.com/115.2-article-Polarizing_filters_test_About_light_and_po=
larization.html
The resulting effect should be a very significant suppression of light
reflected from the camera lens, making it less visible for the spyfinder
devices. The price is some attenuation of the light passing through the
filter, leading to a darker, more noisy image from the camera.
Disclaimer: I do not have a sample of such filter available so I can not
test it. Theoretically it SHOULD work.
On Mon, 3 May 2010, socalsweeps wrote:
>
>
> http://sherlockinvestigations.com/index.php?page=tscm-thanks
>
>
> I found this free twenty page download manual by P.I. and TSCM expert Ski=
p Porteous very interesting.
>
> Check it out
>
>
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Received on Sat Mar 02 2024 - 00:57:19 CST