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Message: <blockquote data-quote="WayneF" data-source="post: 261091" data-attributes="member: 12496">Well, shutters are 1/4000 or 1/8000 second, which is pretty fast.  That would be a wide open lens at ISO 100 in bright sun, but higher ISO could stop down some, or shade could help.   Or speedlights at low power are even faster, but then you have to reduce bright ambient substantially.Just as an example of the process:   Water drop splashes at 1/64 power work very well (might be overkill).  The SB-700 for example has Guide Number 9.5 (feet) at 1/64 power, 24mm FX at ISO 100.  Double that for ISO 400, is GN 19.  So at f/16, that is 19/16 = 1.19 feet, which works OK for water drops.  Or two flashes are double power, one stop, which is 1.4x GN.</blockquote>