That helps Skip, but can you explain how 2 stops would equate to ISO...It
appears as if you multiply your ISO by 2 then do it a second time or divide
by 2 then do that again to get 2 stops either way...If I was shooting 800
speed film, could I then set the ISO at 400? This would then open up the
aperature more? Would this affect the speed of focusing? Which direction
would be overexposed and which would be underexposed? Thanks for your help
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