Most of my interchangeable lens RF's do not have built in exposure meters. With those I pack and use a Weston Master II (model 735) or Weston Master 715. These 50 and 60 year old meters give as accurate results as they ever did. I use those for starting points, and often meter off of my hand oriented at the same angle to the sun as my subjects to get exposure values. Usually I'll open up a stop over what the meter advises. I use the Canon 7, with its built in Selenium meter, the same way. I usually end up with 1 stop more exposure than the Sunny-16 rule would call for. Color Negative film, as mentioned before, has a lot of latitude. I seem to get better overall results when over-exposed by 1/2 to 1 stop.