Reply To: Drop of Water Home › Forums › Photo Critique › Drop of Water › Reply To: Drop of Water September 25, 2014 at 7:39 pm #7642 Mr. QuebecParticipant What do you mean by ”optical slave”? I have noticed nothing special about my 430EX, which is the older version of the 430EXII. This reply was modified 56 years, 5 months ago by .
