[ATM] question about Couder Zones

["Rich Ball" <ShooterBall@hotmail.com>]

On the standard Couder mask I presume that Zone #1 is the first zone outside
the area that would be blanked out by the secondary, perhaps 1.8 inches ID?
..not the center of the mirror.  I note that the value of Zone #1 in
examples I've seen is never zero.  Is its value then the difference between
the absolute center of the mirror (the part that never gets used) and that
first useful zone #1?

--Rich Ball
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