Feature:1. High Definition Recording: This 5MP lens delivers high definition, sharp videos and images, even in poorly lit environments.2. Fixed Focus Lens: The universal prime lens can objectively record and reflect the speed and rhythm changes of the subject, which is very suitable for monitoring babies, pets, etc.3. Fast and Secure Connection: The standard M12 thread ensures a quick and secure connection, significantly enhancing the device's reliability and performance.4. Easy Installation: The lens is designed for easy installation and disassembly, which doesn't compromise the installation and use of other accessories.5. Optical Parameters: The fisheye lens has 1.8mm focal length, F2.0 relative aperture, M12 x 0.5 interface, 180 field of view, 1/3 image size.Specification:Item Type: 1.8mm Fisheye LensModel: CW BL1820 5MP 1Pixels: 5MPFocal Length: 1.8mmRelative Aperture: F2.0Interface: M12x0.5Image Size: 1/3Field of View: 180Dimensions: Approx. 20x19.9mm / 0.79x0.78inOptical Back Focal Length: 6.3mm Mechanical Back Focal Length: 3.8mm .Package List:1 x 1.8mm Fisheye Lens