The OAG-8300 has a pretty short optical path for the guide camera since it's designed to fit the ST(F)-8300M/C cameras directly behind it, and also has a 0.7x reducer built-in.
If you have enough back focus with your scope/camera set up, you could potentially add a spacer between the OAG and your *main* camera so that there's enough room to bring your SSAG into focus.
However, since the SSAG is not very sensitive as a guide camera, it may be a futile exercise...
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