Quote:
Originally Posted by wulfgar
So if all that is true.
Why does a spherical mirror work for an F12 and is something of a disaster in an F4?
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Err...now I see where you are coming from ...who makes a spherical mirror these days ?
A 6" F12 has acceptable level of spherical aberration. (probably 1/8 wave wavefront). However the manufacturing tolerances on the surface are no greater than an F4 ....