1. You will need to change the aperture and shutter speed, and take the same photo with differ exposure photos. Then using software the photos will be mashed together and blend the photos creating a better picture, with better focus and light.
2. A camera, a tripod, and HDR photo-blending software.
3. When the subject exceed the dynamic range of the camera.
4. HDR techniques allow both ends of the light spectrum to be seen in the photo, which we wouldn't have seen without the HDR software.
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