Re: [ATM] Batterson address change

[Chuck Taylor <chucktaylor@speakeasy.net>]

>>>> II) For those who want to produce F2 or F1 mirrors, the only problem is parabolization, which is very difficult at such ratios. In these days of computerized corrections, what of a CCD which takes the image from a perfect spherical F1 or F2 mirror and corrects for aberration?  Thus, the hard part could perhaps be circumvented. Would this be possible?

The problem is that the ccd has no way of knowing which part of the 
light came from which part of the lens. So the computer program could 
not know which way to move it and how far to create the correction required.

This is very different than optical correction because in optics, that 
knowledge is retained --- a parracor in effect not only receives the 
light, but distinguishes where it came from by the angle it arrives at. 
A parracor or other optical corrector then reacts differently to the 
light depending on the angle the light strikes the corrector. A ccd does 
not and therefore does not retain that information, information that is 
needed to make the correction in the proposed computer program.

Hope this helps

Chuck Taylor
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