inexpensive (~$99) very thin fun lens (hence “bodycap”)
quite good image quality for a lens of this type however VERY soft in the corners, and lacks contrast and punch of a conventionally designed lens whilst not being as wide a field of view nor as close focusing as a normal fisheye lens
specs
140 degree field of view rectilinear fisheye (ie. it does not give a circular image)
manual focus down to 0.2m via a lever on the front which also acts as lens cap barrier
you can set it to the middle focus position which practically gives focus from 0.5m to infinity
fixed aperture at f/8
no electronic communication with camera
THUS you MUST set the IS focal length setting if using image stabiliser
5 elements in 4 groups including 2 aspherical elements