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Originally Posted by bojan
It is not a good idea to move primary closer, you may have vignetting due to secondary being too small ....
Low profile focuser is a way to go.
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Yep low profile focuser would be the ideal.
Bringing the focal plane way outside the ota can do what bojan said.
Do yourself a favor and download the program "newt" which can do all the calculations for you of how big your secondary needs to be to fully illuminate the ccd chip.