Equisolid

{
  "id": "MLC-T-IND-006964",
  "term": "Equisolid",
  "field": "Industrial and trades",
  "definition": "Relating to a projection in which equal areas of the image correspond to equal solid angles of the scene, as in equisolid-angle fisheye lenses. The distance of an image point from the centre is proportional to the sine of half the angle from the axis, r equals 2f sin(theta/2), so brightness stays even across the image. It differs from the equidistant projection, in which image distance is proportional to the angle itself.",
  "subject": "Optics and imaging",
  "translations": {
    "de": "equisolid",
    "es": "equisólido",
    "fr": "équisolide"
  },
  "url": "https://mlchart.com/terminology/industrial/equisolid/"
}