Attach the HAL 250 4.3mm fisheye lens to your mirrorless camera with the Entaniya EF-Mount Adapter to achieve an ultrawide-angle look with your footage. The distance from the bottom to the lens to the sensor is shortened to accommodate the fisheye lens's specifications. The adapter is made up of two sections, the main adapter and a red ring sized to the diameter of the compatible HAL lens. A rear back cap is included to protect the mount adapter, and a RED mount modifier is separately available.