Assertion: lens's distortion | /r/HasProperty | characteristic of a fisheye lens
Facets:
Source sentences:
text: Ultra-wide angle lenses come in two varieties: Fisheye lenses with curvilinear barrel distortion, and rectilinear lenses which are designed so that straight lines in the scene will render straight (uncurved) in the photographic image and thus lack the extreme distortion that is characteristic of a fisheye lens.