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Not sure about the effects of your focuser, but I've had the best results with the William Optics Field Flattener 4 on my ED80. My focuser is the GSO 10:1 crayford. I imagine the only dramas would be more-so on the length of the focuser rather than the diameter, because the WO FF4 does put a bit of distance between the camera sensor and the scope OTA.
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