Axis lighting
Light directed towards the subject from a location close to the lens.
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More Photographic Terms ...
-Axis lighting - light pointed at the subject from a position close to the lens.
-Azo dyes - compounds forming colors of great strength and purity. Used in camera filters and integral tripack dye-bleach materials.
Off-axis lighting.
The other issue here is that light from a camera-mounted flash unit originates pretty close to the lens axis. And, as noted elsewhere in this article, this is a pretty unnatural place for us to see light emerging.
Axial or Axis Lighting
Illumination from the lens axis using light reflected from a partially mirrored glass angled 45 degrees in front of the lens. Used primarily for medical and scientific recording where access or shadows are a problem.
 See also: Subject, Lighting, Light, Lens, Wide angle
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