Re: [ATM] ATM: Slit equipped and slitless testers-

[Mark Cowan <toolontop@yahoo.com>]

Quite true, the slitless and slitted tester operate identically when the KE
closes down enough to show shadow detail.  I've taken hi-res foucaultgrams that
illustrate that very fact - and using a very narrow slit doesn't improve
detail, merely adds diffraction artifacts.  If anybody's interested in seeing
them I'll send you a copy.  BTW I now use a 200 micron slit on my tester - same
as you.

I just didn't get what the original question was about...

Best,
Mark


--- David Harbour <stainless_steel@suddenlink.net> wrote:

> Gary, Roman-
> 
> Only two thought it worth while to check in. You both voted with me. So, 
> here it is for you guys: (not that it matters; anyone who needs math may 
> skip this windy dissertation)-
> 
> If, when one arranges the knife edge on his or her tester, so that it is 
> simultaneously one side of the jaw of the slit (this is easily accomplished 
> by merely staggering two razor blades, lengthwise, vertically, by half their 
> length, each one) then, even though one has a slit behind which to place his 
> or her favorite kind of illumation source, the slit equipped tester also 
> operates, automatically, every time the KE is advanced in from the side, 
> laterally, as a SLITLESS tester.
> 
<snip>


      
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