Re: [ATM] The zonal Foucault test is free of inherent correction bias

[Ken Lowther <hermit@outofoptions.org>]

Quoting vladimir sacek <vlad@copper.net>:

>
> Ken Lowther wrote:
>>
>> Quoting Michael Peck <mpeck1@ix.netcom.com>:
>>
>>> This is being crossposted to both the ATM list and ATM_FREE. For 
>>> the benefit of those on the atm list who haven't followed recent 
>>> threads on ATM_FREE, a hypothesis has been advanced that zonal 
>>> Foucault tests are biased towards undercorrection, at least for 
>>> relatively large, fast mirrors.
>>
>> Isn't this why we tried the 'round robin'?  I can see differences by 
>> f ratio, but why would size matter?
>
> Giveen f-ratio, the amount of spherical aberration of a paraboloid at 
> r.o.c. increases with the diameter.

Not readily intuitive to me. Could you point me to a reference on this?

Ken

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