Get a lower profile focusor and a bigger diagonal ?
The draw tube is too long.
The draw tube is so long it is stopping some of the light from the secondary from reaching the focus plane of the camera.
A bigger diagonal will ensure full illuminations of the fov (no drop off).
You should have moved the primary rather than secondary.
Last edited by Ian Robinson; 30-08-2008 at 10:15 PM.
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