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Just caught up with this. Yes going deeper makes a huge difference. Every 6 degrees halves the noise level upon stretching. One of the reasons I bought the new 683 was the increased cooling capacity. I have been usingg -25C easily and the extra cooling has helped a lot with images. Your gear should be able to hold -30C easily. Graeme has a micro line and it holds -30C all year long. Your camera has slightly better cooling still and you could do as Greg has suggested.
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