[ATM] Optical flat part II

[Vladimir Galogaza]

He Francis,

> While even Malacara does not go into great depth about 
>the autocollimator and it is largely ignoerd in most circles, 
>this is a far easier more accurate and reliable test to 
>perform than the foucault test. 

Admittedly I do not get this. I thought that Foucault test can be
done from ROC or from focus by autocollimation.
But in both cases it is Foucault KE test.
What do you mean by "autocollimator test" which is not
Foucault test .

Regards
Vladimir.