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Jo from my understanding the focus plain of an eyepiece is where the field stop is which is the ring inside the eyepiece looking from underneath. So cameras usually need a bit more distance to get focused than an eyepiece.
Also if you go for different rigs for imaging and eyepieces then you might be able to look at different secondary mirrors. With my 16 I use a 70 mm for imaging and an 88mm for visual (don't do that often though) as my camera has a smaller field of view.
You just need to figure out where your even illumination field needs to get to.
Justin.
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