Sunny-16: for optimum exposure when shooting on a clear, sunny day outdoors (distinct shadows), set the aperture to f/16 and the shutter speed as the reciprocal of the ISO.
While reading about the sunny-16 rule, I found a table (below) that shows which shutter speed is needed to maintain the same exposure as f/16 with 1/200 @ ISO 200 when aperture is opened up one stop at a time and the ISO is kept at 200.
My question is: If I was shooting action in heavy overcast conditions (very dim and dreary with no visible shadows), then the heavy overcast-5.6 rule would apply. Given that I must use a shutter speed of ~1/2000 sec to freeze the subject motion, should I use:
a) f/5.6 with 1/2000 sec @ ISO 2000
b) f/5.6 with 1/2000 sec @ ISO 200
c) f/5.6 with 1/1600 sec @ ISO 200
d) neither (a) nor (b) nor (c).
Answers appreciated. Please correct any errors as I am not well versed with this yet. I am planning on buying my first DSLR and lens soon but I am not sure which lens aperture is best for my purposes.