I am out of my league here but i am guessing that if a telescope has a curvature deternined by say zt = ax^2 + by^2. I would imagine the corrector would have some equation like zc = -(dx^2 + ey^2)/c.
The graph attached shows an one dimensional example of what i am getting at.
The blue line is zt=x^2 curvature of telescope
The red line is zc= -x^2/3 curvature of corrector (shown as positive for display only).
The green line is the result zr = zt+zc.
This assumes the reducer only increases the range of x and y (the field size) and does not affect the curvature in anyway.
Perhaps if users could post a flat field with and without a reducer/corrector on diffrent scopes. We could analyise and determine the equation for it and be able to predict the outcome on a given scope.
It would be good to see something like CCDInspector used by those who have it to provide data like this. Then we can create some kind of online database. That is we now zt and the result zr we just find zc = zt - zr.
Better still the manufacture provides the equation for it, at least the equation they are trying to get.
Last edited by netwolf; 11-05-2009 at 06:25 PM.
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