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Fisheye is not only wide angle below a certain focal length such as 18mm.

It is also a matter of how the image is projected into the sensor/film.

The nikon 14-24 f/2.8 zoom for example is not a fisheye even at the 14mm end because it does a rectilinear projection: lens imperfections aside, straight lines in the scene are rendered as strait lines in the photo.