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 1 Pixels: 5MP Focal Length: 1.8mm Relative Aperture: F2.0 Interface: M12x0.5 Image Size: 1/3 Field of View: 180 Dimensions: Approx. 20x19.9mm / 0.79x0.78in Optical Back Focal Length: 6.3mm Mechanical Back Focal Length: 3.8mm . Package List: 1 x 1.8mm Fisheye Lens