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Re: ATM Astigmatism
Hi,
Yes I know but its not so easy, like with the sphere. You have to move it and its rotating a little bit , ok. But if you
test a sphere from CoC or a paraboloid at a star by means of Ronchi, it is easy to see astigmatism, because the lines
are visible bent. You dont have to guess if there is bending something or turning a little. Thats the advantage of the
0-test.
Martin Trittelvitz
Ricardo Dunna schrieb:
>
> Martin Trittelvitz wrote:
>
> > You are right, with a paraboloideal mirror it is difficult to
> > impossible to see astigmatismus with Ronchi.
>
> Don´t agree. Move ronchi grating in and out near around focus and
> look. If lines appear to rotate a bit or change direction, it´s
> astigmatism.
> Ricardo Dunna
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