Re: [ATM] Calculate Astigmatism

["Donald \"Don\" Ware" <mimas@charter.net>]

----- Original Message ----- 
From: "Woodchuck" <djv@bedford.net>
To: "Stephen C. Koehler" <koehler@securecomputing.com>
Cc: <atm@atmlist.net>
Sent: Wednesday, March 24, 2004 2:52 PM
Subject: Re: [ATM] Calculate Astigmatism


 > A certain precision in construction of the KE apparatus would be needed,
> though, otherwise a "re-zero" step with the central zone would be needed.
> It would seem easier to construct a rotating knife edge than a rotating
> mirror.  Maybe it could be done optically, with a Dove prism?

You would also have to rotate the Couder screen and any lateral shift during
the rotation might impact the results although this would be small.  If
you're using James Lerch's RTAFT, the digitization of the zones is still
fixed on one axis, although I presume this could be changed, (what say you
James?).

Don Ware
Hollis, NH
http://webpages.charter.net/dware1/



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