RE: [ATM] over&under correction.

[Michael Peck <mpeck1@ix.netcom.com>]

At 11:41 7/11/05, Scott Milligan wrote:
>spent warning against residual turned up edge.  In my (perhaps overly
>simplistic understanding), a zonal error of slope Y and amplitude X has the
>same impact on MTF regardless of sign, even if for other reasons, one is
>more easily detected via the star test than the other.  Comments?
>

Scott:

That's correct. Take a wavefront, invert it, and you get the same image 
structure at the diffraction focus and the same MTF. This must be a 
corollary to the global phase ambiguity that interferometrists are familiar 
with.

Since people are complaining about quoting styles, I'll offer a quick 
comment. I don't use Outlook or Outlook Express, but it appears in Outlook 
you can change the quoting style by clicking on Tools/Options..., clicking 
the E-mail options button in the Preferences tab. In the box that comes up 
there's a drop down entry for "When replying to a message." The traditional 
choice is to prefix each line of the original with some distinctive 
character, usually >.

Some of us cranky old farts really appreciate it if quoted originals are 
edited down to as little as needed to provide context for the response.

Mike Peck


_________________

Michael Peck
email mpeck1@ix.netcom.com
Wildlife photoblog! http://wildlife-pix.com
Amateur telescope making http://home.earthlink.net/~mlpeck54/astro/astro.html 

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