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Re: f/32 testing

  • From: T3D john bercovitz <bercov@xxxxxxxxxxx>
  • Subject: Re: f/32 testing
  • Date: Sat, 12 Apr 1997 07:30:08 -0700
Well, you got me going early this morning.  8-)  I agree with 
your math.  The only thing I can say is that all this is based 
on the Rayleigh criterion which is that the first minimum falls 
on the adjacent image's maximum and that this is an arbitrary 
criterion which is very sensitive to contrast.  I used a target 
with a contrast of only 2 stops.  I think the problem is 
somewhere in that area.
 
Note that the values I gave in my previous post are approximate.
There are slightly different values according to whether you are 
trying to resolve lines or points and I'm not sure I got that 
right.  The values ought to be with 20% one way or the other.  
No time to look into it now.

John B


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End of TECH-3D Digest 143
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