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Thanks for that advice - good idea to look up the chip imaging history rather then the camera- I'll try at the weekend. also very interested in your positive feedback on the ASI224. With a 70mm scope sensitivity is going to be an important issue. Will have to calculate a bit and think hard about the trade-off between resolution and FOV that you pointed out.
There will be a fair bit of natural cooling as the temperature gets to near zero C or below in the Blue Mountains. Coolings not going to be available as I'm hiking and there's a strict weight budget and I need to include hot coffe and a sandwhich or two! I'll carry a freezer suit in the tripod bag; don't really want to wear a freezer suit on the train:~) I'll be using an ultra light weight mount with auto-guiding on an EQ3 and prepared if necessary to stack a large number of frames of about 1 minute to 10 minutes each so the low read noise of the ASI224 will come in handy if that's the camera I choose.
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