Originally Posted by Steven L
I would divide this into 1/20 and 1/40. Making it a total exposure time of 1/60.
No. that would be over-exposed. to make up 1/60 you would need two exposures of 1/125 or four of 1/250 (or any other combination which keeps the shutter open for an equally long time).
It won't alter the dynamic range though.
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