[rcheshire (Rowland)]

Thanks Alistair and Jay. I've moved the experimental work to a 1000D, because they are a no brainer and easy to play with and added an Astronomik uv/ir clip-in to correct the full spectrum mod, which seems to have improved the performance of the electric defogger. I want to follow this through and test it over several nights of high humidity. Though it seems to manage a cold finger temp of -5 -7C OK. Drier air -10C.

I am accumulating second hand cameras for parts at an uncomfortable rate. 1100D sounds interesting, but I have a 40D to do first.

I am not pursuing the 5d mkii until I have more data. These cameras are perhaps the least robust, in my experience.

I am also testing an improved pwm system that seems to be quieter than other designs I've tried.

I do this stuff out of curiosity. It's fun and interesting. As I get older, the late nights imaging are not compatible with my line of work. I can't afford the fatigue levels. So this keeps my interest between star parties.