From: "Kristopher Barrett" 
To: 
Reply-To: "Kristopher Barrett" 


> Please explain how a corrector plate changes or overcomes these
> diffraction effects?  (I don't think it does.)

A corrector will deal with on and off axis fuzzyness/aberation of point
sources. It will also allow one to get closer to the diffraction limit with
spherical surfaces ( not a small consideration, a correct parabola is more
difficult to achieve than a correct sphere ).



You are right about contrast... only a bigger objective will have a noticable effect.

--
Regards,
Kristopher Barrett    http://www.cotse.net/users/kbarrett

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