Re: [ATM] Re: [atm_free] The zonal Foucault test is freeofinherent correction bias - some supporting graphs

[Ken Lowther <hermit@outofoptions.org>]

Quoting Mel Bartels <mbartels@bbastrodesigns.com>:

> I've not been plagued with Foucault issues, but I've observed others 
> who have had consistent trouble.  I've always lazily ascribed 
> psychological reasons, but perhaps there is a physical basis.  That's 
> what's being debated now: Is there a physical basis that might be an 
> explanation?  Don't forget the entire gamut such as mirror cooling on 
> testing stands, mirror deformation on testing stands, biases on how 
> the test is applied, et al.  If a physical basis is found, it still 
> remains to be demonstrated that it is the cause, as do psychological 
> reasons.
>

To be honest I almost directed the original post to you. I'm glad you 
answered.  All of your postings and postings about you seem to indicate 
quite a proficiency in the star test.  I didn't post to you directly 
though because I thought you did Ronchi and star testing on your 
mirrors so I was hoping for your observations about what people claimed 
versus what you saw, especially on larger mirrors.

After your first line, I would vote for impatience and the inability to 
be 100% honest with yourself as being the biggest errors.  Ken

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