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I found that you need to use something in the order of a 8 to 12mm EP to get it reasonably close to centre with the DBK31.
I found it frustrating on 2 accounts
1) you need to get the EP parfocal, so get some parfocal rings - you could be out a fair distance - some things I could see in the EP were completely missing from the CCD because of the distance until I got them closer matched
2) the chip is pretty small, so I got a zoom eyepiece (mine goes from 8mm to 24mm). Doesn't even have to be a "good one". Have it way out at 24mm first to get it rough centred, then zoom in right down to 8mm to make some fine adjustments (in steps if you have to if the star is dim or jumps out of the FOV). If you've parfocalled the EP, then you should have your image sitting there when you slip the camera back in, pretty close to perfectly focussed too.
The flip mirror system is great (make sure the cam is in the "clear path", not the mirror path!). For me though, it takes up too much backfocus for my purposes in general for it to be worthwhile.
Turbo
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