RE: [ATM] ATM re: foucault pitfalls

["Koehler, Steve" <Steve_Koehler@securecomputing.com>]

> It is necessary to get
> your
> eye very close -- single digit millimeters -- to the KE to see the
> patterns.
> That's one reason video is becoming so popular.  Mount the camera, no more
> worries about getting into the right position.

For visual testing, a small 2x "telescope" behind the knife does quite well to
keep your eye away from the knife edge and to provide a slightly magnified view.
The telescope can be constructed from an old binocular eyepiece and a small
surplus objective lens of an appropriate focal length.

-- Steve Koehler
   steve_koehler@securecomputing.com

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