[ATM] RE: [atm_free] zone one challenge

["James Mulherin" <jcmulherin@opticalmechanics.com>]

Steve:

I'm kind of surprised I got it right (J). I almost went for K. Here's how I
decided:

(I) looks to me like it has a perceptible imbalance left to right with the
right opening having more dark area than the left. And the dark area in the
right opening definitely looks darker than the dark area in the left
opening.

(K) I notice that the dark area in the left opening seems just a bit darker
than in the right opening. Also, the dark area in the right side of the
right opening seems a bit too narrow. 

Based on the above I went for J.

James

James Mulherin
Optical Mechanics, Inc.
jcmulherin@opticalmechanics.com
www.opticalmechanics.com
Tel: (319) 351-3960
Fax: (319) 351-3943

> -----Original Message-----
> From: sentto-7027688-6026-1112197596-
> jcmulherin=opticalmechanics.com@returns.groups.yahoo.com [mailto:sentto-
> 7027688-6026-1112197596-
> jcmulherin=opticalmechanics.com@returns.groups.yahoo.com] On Behalf Of
> Koehler, Steve
> Sent: Wednesday, March 30, 2005 9:47 AM
> To: atm_free@yahoogroups.com; atm@atmlist.net
> Subject: [atm_free] zone one challenge
> 
> 
> 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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