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So the glass of your corrector is near the OTA?
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Yep. The
3 KORRW is 137mm long and needs about 58mm back focus. I had to add a small spacer between the corrector and the camera to get the correct back focus as per the spec.
Although the sizes are different to the MPCC, the principle is the same. You want to minimise the distance from the secondary to the CCD chip, so the ideal is to have the corrector glass in line with the OTA wall.
James