[ATM] testing an f/2.6 mirror?

[Vladimir Galogaza]

Hi Nils Olof,

>But based on my limited experience, I'd say the test is a bit 
>sensitive - trying a hand-cranked (geared-down) tester has never 
>given  useful results for me, no doubt due to disturbing the setup 
>by the odd  few microns, while turning the dial. With a remote,
>computer controlled stepping-motor setup however, this has 
>not been a problem for me,  even  with a set-up that is far
> from rock-steady.

In my interferometry  experimenting this  is extremely
prominent.
With minimum five adjustments to touch and turn it is disastrous.
When I touch dials everything changes and I have to turn dial, leave it
and wait until everything sets, to see effect of turning.
I will appreciate any practical advice for implementing computer control.
Required adjustments are small in range but should be fine.
Translations, within  1 mm, rotations less than 1 degree.

Regards
Vladimir.