[ATM] zone one challenge

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

I believe I have found a possible source of bias in reading zone one in an
8-zone test of an 18" f/4.5.  I have written up my ideas in the following
report, which includes a challenge to find the null for zone one from a series
of 15 simulated images.

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

As I mention in the report, I would like to hear from anyone who gets the right
null the first time.  What technique did you use?  Please don't inundate the
lists with reports of your answers, especially if they follow my prediction that
most people will read about .004" inside the proper null.

-- Steve Koehler
   steve_koehler@securecomputing.com


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