I used it with the big flange for video astro -then focusing the moonlite didn't affect the FR-camera distance and the amount of focal reduction.
Forget the diagonal. On top of the moonlite the FR-camera distance will probably be too long.
I really liked the moonlite but sold it in the end as i couldn't get it to work with a meade f3.3. Couldn't get it to focus. Just used a little celestron motor focuser on the C8's focuser knob. Was good enough for a hack like me.
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