Exposing for the sky

If you want to have dark cliffs
and the right exposure for the sky
just use the sunny 16 rule. Your meter
might be looking at the dark cliffs and
if you expose for the cliffs the sky will
burn out. So at ISO 100, use 1/125 sec
at f16 or its equivalent and the sky will
be well exposed. That's the standard
exposure for a sunlit scene. I lightened
the cliffs a bit in photoshop but they
could look good in black too.