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A variation on the car-fridge theme
I'm still waiting on a couple of thermoelectric assemblies to arrive (one from China - 60watts air-to-air and another rated at 15W same design but from the US). But I've already moved into design two - hopefully a lighter and with much smaller volume inside.
I've used the light aluminium tub that was inside the car-fridge I had used in design #1. So it's smaller in all dimensions and extremely light. Of course its open at the top so I got the tin-snips out and massacred the lid of an old biscuit tin, pounded some lips on the edges and it sits nicely on top of that tub. Holes for the DSLR in the lid and a hole in the base of the tub for the peltier.
As luck would have it, the distance from the back of the camera to the bottom of the tub is 60mm and the height of the cold side of the peltier device/fan/etc is 54mm so there'll be a small clearance only and the cold will blow directly onto the back of the camera. I've got the polystyrene lining that comes from the car-fridge and can easily trim that to fit inside this design so there should be good insulation. I may later put some on the outside as well if the temp doesn't drop enough.
The good thing about using the biscuit-tin for the front face is that it is thin and light. So I can attach the T-Ring to the optical train without having to insert another coupling/adapter/ring and screwing up my backfocus.
The whole box is just held together by ZIP-ties but that's not a biggie.
So far, design #2 is looking to have most of the boxes ticked.
Peter
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