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I noticed lately that my Sony A7S II will pick very high ISO (12800) combined with very short shutter times (1/8000s) when in aperture priority mode. What would cause it to do such a thing? Did I accidentally change a setting somewhere?

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On some SONY Alpha cameras there is a setting for minimum shutter speed. It give you a option (when use AutoISO) to set more modest or more aggressive shutter speed. Please check, maybe you set somehow this option to very aggressive value. You can found it at MENU> Camera Settings>ISO AUTO Min. SS.

The options are:

  • FASTER (Faster)/FAST (Fast)
  • STD (Standard)
  • SLOW (Slow)/SLOWER (Slower)
  • 1/4000―30"

You can find more information in the manual.

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