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Any camera or lens may be used because only visible wavelengths are being recorded. UV can also induce infrared fluorescence and UV fluorescence depending on the subject. For UV induced non-visible fluorescence photography, a camera must be modified in order to capture UV or IR images, and UV or IR capable lenses must be used.
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A camera trap is a camera that is automatically triggered by motion in its vicinity, like the presence of an animal or a human being. It is typically equipped with a motion sensor —usually a passive infrared (PIR) sensor or an active infrared (AIR) sensor using an infrared light beam.
The introduction of the terrestrial Crittercam made it possible for researchers to monitor the animals and their activity exactly when it occurred. Previously, the cameras could only record data and images for future playback once the camera was retrieved from the animal. When introduced in 2001 the camera was about half an inch in size.
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Field of view is the area of the inspection captured on the camera’s imager. The size of the field of view and the size of the camera’s imager directly affect the image resolution (one determining factor in accuracy). Working distance is the distance between the back of the lens and the target object.
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24-camera rig with tripwires. Muybridge continued the studies at Palo Alto with 24 cameras in 1879, producing further chronophotographic pictures of more horses, some other animals, male athletes, and a sequence depicting a horse skeleton jumping a hurdle (utilizing a technique that resembles stop motion).