Hello i might sound dumb but as a newbie i tried to figure out depth of field and over exposure thing. Cannot find info online to this particular problem.Hence i have b&w film Iso 100 and it's a sunny day. I want to take portrait photo with person standing 1-2 m max. I want to have deep DOF. Should i change aperture from f/16 to f/1.7 . What about shutter speed? Does it stay at 100/125 according to sunny 16 rule? I have 50mm lens. Definitely dont want photos to be overexposed. Please help !