How to Create High Dynamic Range Photos
EV, short for Exposure Value, can be defined as the various combinations of camera shutter speed and relative aperture that give the same exposure. For example, 1/30th at f/8.0 is the same EV as 1/60th at f/5.6, and so on. So, if we have a scene with a dynamic range of between 5 and 6 EV our cameras can record detail in both the highlights and shadows areas of the scene. Beyond 6 EV and we must sacrifice details in one extreme or the other.
If we think back to our first example – the shot of the tower and the pier – we can calculate that we would need a camera with a dynamic range of 11 stops to capture the entire dynamic range of the scene (assuming that the native range of our camera is around 6 EV). This is because our overexposed image was +2 EV from the original exposure and the underexposed frame was shot at -3 EV.
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Tags: camera shutter speed, combinations, exposure value, hdr, High Dynamic Range, highlights and shadows, overexpose, relative aperture