I've always had a problem when shooting people with sunsets in the background.
Because it is a little bit dark, I will usually fire a flash at the people.
However, I would like to know when using the Aperture priority mode in slow sync flash mode, do you meter the sky or the human face, assuming the flash gun (external flash) is set to auto?
Because right now I can't seem to get it right and I'm mostly using full manual for my body and flash but sometimes it takes way too many tries to get it right and I lose the enthusiasm from the human subjects.
Or am I missing out something or doing something wrong here?