Welcome to our store！</br> 1、LARGE APERTURE: Manual zoom lens is equipped with a large aperture of F1.6, which can effectively increase the shutter speed in darker environments and the image remains bright. 2、ADJUSTABLE FOCAL LENGTH: 4‑18mm adjustable focal length with manual focus ring and aperture ring to help you get a clear image at different focal lengths. 3、C MOUNT: The short flange distance of the standard C interface lens can be used with the adapter ring on camera bodies with various interfaces (adapter ring not included). 4、APPLICATION AREAS: 3MP HD images, industrial grade low distortion images, multi layer coating process for optical lenses, widely used in mechanical equipment, industrial inspection, machine vision and other monitoring scenarios. 5、DURABLE MATERIAL: Large aperture lens selected premium metal material, with good durability and stability, can be used for a long time. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: Camera Lens Material: Metal Focal Length: 4‑18mm Image Surface Specification: 1/1.8 inch Relative Aperture: 1:1.6 Interface: C Mount Flange Back Intercept: 17.526mm Zoom: Manual, Lock (W/Lock) Resolution: 3MP Close Up Distance: 0.3meter/11.8in <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x C&nbsp;Mount&nbsp;Lens Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>