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Looks like a cool project, I went down a similar path to make a cooled planetary camera from what is probably the same board (IMX291 from AliExpress).
I tried a few different heat sinks and peltier devices but eventually found that a small 5v TEC plus that heatsink could get down to near zero even when powered from USB (with very careful current limiting and control though).
The camera itself was a bit flakey so I shelved it, not sure if it had to do with all the heatsink compound on the back of the board to try and get the heatsink to work a bit more effectively, but as long as its not got anything conductive in it, it didn't seem to hurt.
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