introduced in 2012 by the small Japanese camera maker Yasuhara the Madoka 180 is the first orthographic projection fisheye for modern cameras and also the first circular fisheye for mirrorless cameras. It was introduced for Sony E mount it has an incredibly good design and construction.
There is a micro 4/3 version marketed by the Nodal Ninja name.
Yasuhara Madoka 180 7.3mm f/4
One of the first fisheyes lens ever for mirrorless apsc.