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Thanks Alex.
Yes I think Johannes had a corrector lens he put in the system and removes the removable secondary.
Ceravolo has an astrograph that has a widefield and a long focal length corrector lens. 12 inch. A bit similar to the AstroPhysics
Riccardi Honders - different design but a bit similar.
I suppose I could put a Tak 1.6 Extender on my AP Honders and use a smaller sensor or crop.
Greg.
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