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Hi Alistair,
The lip (I'm assuming you mean the segment where the screws are) is 10mm and so when the focuser is fully racked in, it leaves a 10mm gap. The longer segment after the thread is 30mm.
I was looking at getting the SteadyStar but the large format version is no longer available and I am not sure that the 40mm optical window (38mm actual) of the standard version is sufficient. After factoring in CCD size it doesn't appear to leave much room for the OAG pick-off prism. Also seems a bit of a waste having a 40mm window when the drawtube has an extra 20mm or so to offer.
I'm not surprised your gear hasn't seen first light yet, the ongoing cloud in Melbourne can no doubt be attributed to a flurry of recent equipment purchases ;-)
Any idea where one can purchase large format (ie 2.5" and 3.0") accessories such as focal reducers, flatteners etc.
Brett
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