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Humidity is probably the most limiting factor. Much of the design in cooling systems is condensation protection.
A 5C drop with just a fan is quite respectable. Rule of thumb is half the dark noise for every 5C drop from room temperature. But that depends on the camera as well.
Peltier modules fixed to the camera base plate, with heat sink and fed say 6V, provides a little extra cooling but it just becomes a monstrous affair. The fan sounds just fine.
A light weight heat sink fan combination fixed to the base plate might provide a little extra cooling.
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