From: "Bill Kelley" 
To: "William Cook" , 
Reply-To: "Bill Kelley" 


Bill Cook et al;
Hear! Hear! Surface smoothness and zonal freedom is why flexed mirrors with
spherical primaries provide such remarkable imaging. Fortunately surface
roughness is more easily seen on spheres right to the edge. Bill Kelley

> I would be pleased to hear from anyone who has chosen to experiment with
> phase contrasting testing. (The Best of Amateur Telescope Making Journal,
> Vol.2, pp 320-345)
>
> I would be especially pleased to learn of any experiments with
modifications
> of the testing procedures or equipment. Surface smoothness (IMHO) gets far
> too little attention from most folks who pride themselves on perfection,
and
> I am interested to see if the article has made an impression on the
optical
> perfection crowd.
>
> Kindest Regards,
>
> Bill Cook
>
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