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It seems that with hot weather it is *better* to use high ISO and shorter exposures. Long exposures in hot weather do fog earlier with noise I have heard.
I recently used ISO 1600 subs with my 40d (each 30 seconds) while in Bali (about 25 C) and after stacking with DSS with only 6-12 frames I got nice images.
Now I have a 6d so I can add an extra 2 stops but I yet have to test it in hot weather next month in South Africa. Here in Holland it is winter now.
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