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.

[table caption=”typical angles: ” width=”500″ colwidth=”50|50|50|50″ colalign=”center|center|center|center”]
weak,medium,strong,max
94,131,180,360
[/table]

see
Fisheye Types