Bracketing technique.
Bracketing is the process of taking three photos; one using the camera’s recommended settings, one intentionally underexposed, and one intentionally overexposed. The reason is simply to be sure you can get a good exposure from a subject that’s hard to meter.
Many cameras have a feature that makes bracketing easy or automated (Mine is Canon 400 D, it has an automated bracketing facility)
When you take a photograph using auto exposure bracketing, the camera captures three images at different exposures. Most cameras take the photos in this sequence: standard exposure, underexposed, and overexposed. I repeated the same with different white balance settings to gain different colour combinations.
Auto exposure bracketing takes up more room on your memory card, and also increases the amount of time it takes to photograph a scene.
If your camera has a bracketing feature that you use, when you download the images to your computer, you can choose the one you like best. or do some post processing to merge the parts from different photos which you like the best.
Below photos are taken on my Macro lens - 50 mm fixed, 2.8.
