Originally Posted by ToddB
Why worry about the inevitable? Try it, and see for yourself why you may never want to do it again, and may choose to pursue other remedies. JJ has it right. This kind of issue becomes almost inevitably addressable by masking techniques. But, if the relative sky and land form exposures aren't too far apart and there are no unavoidable insertions into the sky, this problem becomes the the domain of practice and skill under the larger, using ordinary burn technique. As I said in a recent post, natural light photography ain't for sissies.
You can ameliorate the situation by using moderate filtration with panchromatic films, no stronger than deep yellow or green, to bring sky values in closer proximity tonally to landforms. That will, in most cases, give you a head start in achieving visualized sky values, as well as highlight separation in clouds, if present. But one also must appreciate the limited exposure range of the film to record the actual range of light (). This is where the rubber meets the road with directed exposure techniques such as the Zone System. By placing exposures thoughtfully one can fit the film's ability to record light to extant natural light, resulting in easier work under the enlarger.