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equal area

equal area lenses are a type of fisheye lenses

equal area lenses are also called “equisolid angle” or “flächentreu”

Equal area lenses use a image mapping function of the type

r = 2 f sin \frac{\theta}{2}

such lenses maintain areas. Objects that have the same area have images of the same area.

typical angles:
weak medium strong max
94 131 180 360

see
Fisheye Types