it’s a 2019 lens, very small and lightweight, giving an image circle slightly larger than the 13.5mm width of a M43 sensor, If used on Fuji, Sony or Canon APSC mirrorless camera, it would produce a small circle, 14.8mm tall, in a big black frame. Remember Aps-c is 24×16 mm. The company specifies the lens can also be mounted on DJI Inspire X5 cameras, it means its weight distribution and mass are compatible with the gimbal. In cameras with protruding handles, microphones, etc. they all could fall into the field of view!
Laowa 4mm f/2.8 Fisheye
manual focus 210° circular fisheye