BACKGROUND
The retina is comprised of rod cells for night and motion sensory information and cone cells for daylight and color vision. The ratio of rods and cones varies by species. Compared to mammals, birds have a greater number of cone cells allowing greater color perception and visual acuity in daylight. Nocturnal creatures, by comparison, have a greater rod-to-cone ratio which allows for better night vision.
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Flash Photography and the Visual System of Birds and Animals
The use of artificial lighting to photograph animals is an area of controversy. To review this topic, a basic understanding of the retina is necessary.
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Sleep and the Nature Photographer
As nature photographers we love the sweet light of early morning. We often endure long and odd hours to maximize our shooting time. How can we ensure that we are fully vigilant and have quick reflexes to capture those fleeting moments of beauty when in the field? What can we do to overcome the so called jet-lag syndrome? Why is sleep important and how much do we really need?
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