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  1. People talk about soft and hard light but really it is just a gradation between them. How does one measure the hardness of light falling on the subject as opposed to the hardness of the source? Clearly hardness of the source would be measured by calculating the angle between the distance of the source and the size of the source. So the sun would be the Tan-1(Sun Height / Sun Distance) = 0.53 degrees i.e. extremely sharp. A blonde with reflectors 0.1m diameter positioned about 5 meters away from subject would be Tan^-1 (0.1/5) = 1.14 degrees i.e very sharp. A softbox 2m high and 2m from
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