I suppose it depends how you set your shot up...
I personally would use my widest angle and probably start at F8. Reason being is because at a wider angle I would capture about 70% of the sky in the field of view and 30% of the landscape etc...
With a wide enough angle (not too wide) you'll get a lil bit of a fisheye giving the sky a cool dome look and with the smaller aperture the entire picture will be sharper.
I would also bump the iso down to remove noise.
I personally would use my widest angle and probably start at F8. Reason being is because at a wider angle I would capture about 70% of the sky in the field of view and 30% of the landscape etc...
With a wide enough angle (not too wide) you'll get a lil bit of a fisheye giving the sky a cool dome look and with the smaller aperture the entire picture will be sharper.
I would also bump the iso down to remove noise.