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Re: [ATM] undercorrecting?
Hi Mel, totally agree with that.
Or try the following simple experiment : direct the air flow from a small fan
on the mirror while observing with the Foucault test.
Jean Guy
Most of the image degradation is
> due to the interaction of the mirror with the air of cooler temperature and
> not due to change in shape of the mirror. You can test for this by turning
> off/on a fan aimed at the mirror.
>
> Mel Bartels
>
>
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