My Camera Pentax SF1N is currently loaded with 400iso film by Kodak (I think either that or Pharmaprix easypix... anyway)
So I think I remember hearing someone say I should put my camera to 400ISO for this film right?

And then I adjust the f-stop/aperture depending on lighting availability (assuming NO flash is to be used at all)
Right?

What is the EF+/- to do with a picture. + numbers make something more exposed. and -less exposed. I usually keep it at 0 or +0.5 for added contrast (Because I like deep rich contract in pictures) is this an error?