Features 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 Lens Model: 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.