Hi Geoff,
I done a search through the posts and it seems a few people have given it a go.....
I have been experimenting with peltier cooling with my 300d.
I shall put up a post shortly with the results and what I did try.
The most I can cool it externally is around 10c below ambient. Does make a difference but I wouldn`t bother setting it up unless it was going it be a warm night like 20c or higher.
The night I did the experiment it was 13c ambient and at the end of imaging there was a small amount of ice on the bottom of the camera which quickly melted away..so inside the camera it should have been close to zero.
I shall get the post up in the next few days...
Cheers Gary
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