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This thread started with the fabrication of a cold finger to fit a 450D. Glen has provided a lot of info about how he modified his camera. So rather than starting again I am picking up where I left off, finally making time to put experimentation into practice.
The first task was a spectrum conversion. Removal of all the factory filters and fitting a modified full frame astro filter in place of the AA filter. The filter is siliconed in place to exclude dust and moisture.
Secondly, fitting an improved resistance heater to the face of the astro filter. Double sided kapton cut to the AA filter dimensions on which 3.3ohm resistors and connecting wires are
held in place for soldering. 4mm strips of double sided kapton are stuck to the edges of the filter on which to fix the heater. Strips of kapton over the heater hold it in place. each resistor outputs about 200ma at 5v.
All the circuit boards are sprayed with lacquer to protect from moisture.
Given that the battery housing with all the control electronics will be moved to this camera, there is little to be done except fitting a temp sensor to the cold finger.
The 1000D may be available to anyone serious sbout cooling.
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