The Inverse Square Law demonstrates the distance between an object and the light array needed to display the object. By moving the camera or object further away you will need more light to display the object within the same lighting as the closer photograph. To balance the light needed for the photograph you must calculate the difference between a close light array and a far light array. From a starting point of light every time the object movement is doubled the light source must be quadruple. Most often the amount of light that you started with is not enough for the finished product that is located further from the camera than the first photograph. In general you will multiply the starting point by 4 for every movement twice the distance away from the original light setting.
As you can see in the two upper demonstrations of the Inverse Square Law that as the light travels out ward it is dispersed among the area and the intensity of the light becomes less. By making calculations to increase the amount of light needed you will provide the proper amount of light to take your photograph. The easiest way to perform the light calculation is to times the distance by 4. It is important to have the proper amount of light; lets take for example that you have a subject that is 4 ft from the camera you then move the subject double the distance away from the camera then the light calculation would be 16d thus the calculation would be 4*4 , next move the subject 4 more ft and the calculation would be 4*4*4 equaling 64 so it would be 64d and so on and on to quadruple the light array as the object moves further from the camera.
The flash can have an adverse effect on a subject when used improperly the flash array is able to submit the subject to too much light in retrospect producing a glair or it could not light the subject at all if the objective is located too far away from the flash. Some of the issues with the flash are how powerful the flash is when actuated. Most flash cameras will not be able to take pictures telescoping over 300 meters. This presents problems with taking surveillance in dark areas camera such as hall ways and under bridges. Some other variables that you must look at are areas that do not refract light, hills, pictures located on wet surfaces and photographs where the subject blends in with the surrounding area in these instances you must choose a special procedure in order to take proper precautions producing the correct lighting balance for the photograph. Other issues you may have when photographing in dark areas are tight places that do not allow enough space to get the view of the whole subject. In the case of a tight area you may want to take the photograph from a ladder or tripod located close to the object.
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