Re: [ATM] side obstruction

["Jonathan Lavoie" <atm@lavoielactee.net>]

I wonder if the effect would be minimized if we smoothed the curve using a 
mask where the intrusion occurs (at the cost of more light loss, but it's 
still really small compared to the primary surface)

Jonathan

----- Original Message ----- 
From: "Koehler, Steve" <Steve_Koehler@securecomputing.com>
To: <atm@atmlist.net>
Sent: Tuesday, April 19, 2005 1:12 PM
Subject: RE: [ATM] side obstruction


Jonathan,

Yes, the effect will be visible, mainly (I think) as a spike on one side.  I
have a filter slide on my 450mm scope that protrudes a little into the light
path.  The extra spike is noticeable.  I ran some simulations a while ago on 
the
diffraction effect of this filter slide.  There's no explanation, but the
results are here:

    http://www.visi.com/~mkoehler/slide/slide.html

If I get some time this afternoon, I can do a similar simulation of your 
setup.
I can do a simulated star test, and also calculate a comparative MTF graph.

-- Steve Koehler
   steve_koehler@securecomputing.com


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