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Thanks everyone. Good input. One of the things that has been giving me pause is the extra weight of the hoses and water hanging off the OTA plus the inherent risks of snagging a hose in the middle of the night and releasing water into an area already thick with cables and connections.
So perhaps I would be safer, and not very much worse off, just sticking to -15 which I can achieve even in mid-summer. Another possibility I'm going to look at is those little bolt-on fans that SX are now selling as an add-on for the SXVR_H18 and similar. In a camera that uses the body as a heat sink (like the ST7 and others) then this may just give me a little extra at no real cost.
Peter
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