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I use a QHY8. For what it's worth, I tried both ways and found I got better results with the FR on the C8 OTA, followed by the Meade then the T adaptor stuff. I have both a Meade and an Antares 6.3 and although it's still early days, I think the Antares seems a little more tolerant. I believe FL for the Antares is 78mm and for the meade is >100mm, forget actual number.
One small advantage of having the meade in between is you can use the main OTA for coarse focusing, and use the meade as a +/-8mm or so spacing adjuster, as you really only need to move it a mm or so for fine focus. I think this is why I liked it better that way.
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