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PLease let me know if my thinking is wrong but the reason I used ISO200 was so I could use the shorted exposure time as the object I was imaging was moving so this was done to keep the image sharp. If I was to use say Iso50 with approx exposure time of 1/2000 4 x slower would the image be as sharp and does ISO really make that much difference for extremely short exposure times like this.
Remeber I am new to this so I am trying make sence of all this.
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