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No Tony look at the image. I am not knocking any other design as it is far cheaper to produce spherical surfaces than the more complex hyperbolic aspherical and parabolic correctors and or mirrors.
I am sorry but I do know a little about optics.
Until I replaced the focuser with BORG parts It was useless as an imaging system.
I am sure the TAL 250K has the same problems although to a lesser extent.
Bert
I have shares in my own ability!
Last edited by avandonk; 18-12-2006 at 06:35 PM.
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