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Re: [ATM] Ball bearing for triangles
> Perhaps the mirror will reach the air temperature very fast, after which
the
> aluminum side radiates most. In this case the mirror will cool below the
air
> temperature?
it's exactly what I think
>Or perhaps the meniscus plays a certain role.
In my case it is not a meniscus. It is a "classical" miror, but quite thin
(40 mm) and with low focal ratio f/3.3=> 28-29 mm in the center. It's the
thin thickness in the center and the big difference between thickness in the
center and at the edge that could cause the spherical aberation deformation.
In a thiker miror or bigger f/d it would certainly not occur.
But remember that at the moment it is only a theory for my mirror. I have do
do some tests before being sure I have this problem
> About you mirror: You wrote that you see some spherical aberration in the
> star test. is it overcorrection or undercorrection?
If I remember correctly, it is overcorrected
>I suppose this is after
> cooling?
yes...
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