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I currently use an 8” f5 newt ( tube diameter 240mm) with an Orion 60mm guide scope piggy backed on central axis in my NexDome and works great with plenty of clearance
In July I’m upgrading to a 10” f5 carbon fibre newt ( tube diameter 305mm ) with an Orion 60mm guide scope.
I use my own custom made Dome rotation control for Azimuthal movement which works well up to 70 degrees in Alt ( beyond that altitude I revert back to periodic manual tweaks of the Dome rotation )
The 610mm slot in the Dome will be fine for a tube diameter of 300mm and say small refractor piggy backed provide you have the Dome rotation automated with Voyager or some other software system
I think the NexDome is designed to handle up to a 14” SCT
To make the Dome slot wider would inhibit the benefits of using a Dome Obs ( stray light , wind and dew etc... )
Hope the above helps
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