From the Qantas website:
Transferring from T2 and T3 (Domestic Airports) to T1 (International Airport)
The Transfer Lounge is located airside (after passing through the security check point), opposite Gate 1 in T3. A shuttle bus service is available to passengers that are travelling or have travelled on a Qantas flight (including codeshare flights^) or oneworld flight. The shuttle buses operate every 10-20 minutes from 6am to 9.00pm AEST. On arrival at T1 proceed up the escalator, through immigration and security to your departure gate. If you do not have a boarding pass for your International flight, proceed to the check-in counters.
So you would still need to go through security. 90 minutes is OK but if your domestic flight is late by even 10 minutes, you might start to stress. I would go for the flight before it just to take that stress away (and give more time to take photos and walk around before the very long flight).
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Eagerly counting down to the next YSSY Spotters Weekend
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