For the record, I went on a week long backpacking trip in SE Utah to some rock art and ruins I have been wanting to photograph for years and when I setup for my first shoot, I realized I forgot my meter. No worries, I used the sunny 16 and some common sense (that alcove seems a little darker...) and 75% of my slides were correct and easily 90% of my negs. Funny, it was almost a higher percentage than if I used a handheld meter because sometimes I overthink things.

It works, just use your brain with it.