ABSTRACT
If something can be seen, it can be photographed. This basic precept of photography can be extended to the photography of things unseen to the human eye by utilizing ultraviolet and infrared radiation (light). The electromagnetic spectrum measures radiation or energy. Energy residing between 400 and 700 nanometers is detectable by the human eye and is perceived as visible light. A nanometer is one billionth of a meter in length, a measurable distancealthough not to the average person. Residing below 400 nanometers is ultraviolet light or energy, and residing above 700 nanometers is infrared light or energy. Photography in these regions of the electromagnetic spectrum can be accomplished through a number of simple, inexpensive techniques. A little practice and experimentation goes a long way towards alleviating exposure and focus errors.
