If I need high shutter speeds and depth of field...lobster activity at a dock at dawn or dusk or an action shot in the barn when it is still dark outside...I will push the ISO
About David
David Middleton is a professional outdoor photographer, teacher and writer. David has been a professional photographer for more than 30 years and has traveled extensively throughout all of the US and Canada and much of Central and South America, South and east Africa and Australia.