I've given this some thought with using a copper plate from the one of the CPU heatsinks with embedded tubing. Aquarium Pump, automotive windshield wash tubing, ice water bucket ..... Not sure how efficient it would be, parasitic heating, achievable delta but water is a better heat transfer medium than air and you could make quite a stable system. One advantage might be size of install at the camera not having a big heat dissipater but lots of other bits hanging off would be a pain.
One advantage could be in the field, a 12volt aquarium pump uses a LOT less power than a TEC.
I hadn't got to the point of a TEC at the output end. Needs more thought as to what you would gain with a more complex setup.
