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I have the OAG for the STF-8300M (I believe it's identical to the ST-8300 OAG) and ST-i guide camera, as well as an Orion mini guide scope + QHY5 (virtually identical hardware to the Orion SSAG).
Your problem may be that your SSAG is too far back from the focus plane in the OAG?
When I try to use the ST-i on my Orion guide scope, it needs a 1.25" extension tube to focus... but the QHY5 focuses fine with its nose piece.
I think this means that you can't get inwards focus travel with the OAG + SSAG combination? With the ST-i, the imaging chip actually sits *inside* the OAG...
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