Some people believe if you're photographing nature you should use only natural light. In fact, I think it doesn't even occur to many landscape photographers to carry a flash into the wilderness.
Well, I do carry a flash while hiking. Always.
Often an object in the foreground is much darker than the background sky, so I use a flash to balance the exposure. In the photo at upper-left, the ocotillo was originally so dark it looked like a silhouette, so I lit it up. Larger objects, like the Devil's Bridge at upper-right, may require multiple flashes (in this case, three). So if the lighting in these images looks a bit unnatural...well...it is. But these photos looked like this when they were taken and I like the somewhat surreal look achieved by adding my own light to the foreground.
How much foreground you can actually light up depends on a number of factors, including of course the power of your flash. However, even the best flashes have a very limited range, so when I say "light up the foreground" I mean the immediate foreground. My own flash, which is pretty darned good, allegedly has a maximum range of about 120 feet. However, if I want to shoot at f/16 for good depth of field, ISO 100 to reduce noise, and still provide enough light on the foreground to match a much brighter background sky, I'm lucky to get 15 to 20 feet of effective distance out of it. Beyond that everything on the landscape is lit only by natural light. Still, even illuminating the first 15 or 20 feet can, in some cases, dramatically improve a photo.
Also, you'll get far better results with your flash if you remove it from the camera's hot shoe and hold it off to the side. Illuminating one side of an object more than the other creates a sense of depth, making it appear less flat and more "three dimensional". Using a single flash remotely requires a triggering accessory, such as a PocketWizard. My trigger system is wireless and very small. If using multimple flashes it's also possible to keep a "master" flash on the hotshoe, which will activate additional "slave" flashes remotely.
Finally, if you're wondering, there are indeed alternatives to using flash to "fix" very dark foregrounds. HDR, which I discuss later, can also be a great way to "even out" difficult exposures. In fact, sometimes HDR produces better results. But other times flash works better. Sometimes I even use HDR and flash together in the same photo. It all depends on the scene and how the sun and shadows are dancing about at the moment.
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