u/Time-Distance-5740

So shooting at f16 using 200 iso film. On a bright sunny day, should I be fine shooting at 250th of a second, being that I don't have 200th of a second? If I do that should I open up the aperture to f11 instead?

Also what about 400 iso film? Should 500th of a second be fine? I don't wanna rely on the meter Incase it ever fails