Alistair. If you still need a filter I have one in a spare 1000D sensor, if it will fit. I can send by post when I get back from Brisbane next week?
In the 1000D, the top glass is the AA filter/Piezo, while the glass in the plastic frame closer to the sensor is the IR-Cut filter - replace with Baader or Astrodon and leave the AA out altogether as it softens focus.
Something I've been meaning to develop for a while is a sensor face heater for a DSLR - it needs to be very small, but having cooled two DSLR's by various means, sensor face heating is essential. Small sticky strip with Nichrome filament.
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