Axis 5901-371 M12 Fixed Focal Lens 10-Pack

Overview

The Axis 5901-371 is a bulk pack of 10 M12-mount lenses, each with a 2.1mm focal length and F2.2 aperture. This lens is purpose-built for wide-angle indoor surveillance where you need broad horizontal coverage without switching mount types mid-deployment. The 2.1mm focal length delivers approximately 147° horizontal field of view—useful for lobby entrances, corridor runs, and compact spaces where a single camera must see wall-to-wall. The F2.2 aperture gathers enough light to maintain detail in moderately dim indoor environments, avoiding the image noise and motion blur you'd risk with slower optics in the same lighting.

Compatibility

The Axis 5901-371 fits only M12-mount Axis cameras—specifically, high-resolution megapixel models equipped with M12 threaded lens ports. These include compact industrial and retail cameras in the Axis lineup designed for modular optics. Before ordering, verify your camera's lens mount by checking the camera datasheet or contacting the camera vendor. M12 is a precision 0.5mm thread pitch—forcing an incompatible lens can cross-thread the mount. The datasheet confirms these lenses are tested and approved for Axis cameras with M12-mount; however, third-party or legacy cameras with M12 ports may not deliver the same optical performance Axis certifies.

Installation Notes

M12 lenses require hand-tightening only—do not use a wrench. Over-torque can crack the lens housing or strip the camera port. The fixed iris (2.1mm, F2.2) means exposure is set once; it does not stop down or open during day/night transitions. If your scene has both bright sunlight and deep shadow (e.g., sun-facing door with dim interior), the fixed aperture may clip highlights or underexpose shadows. The lens body is 19mm long by 16mm diameter—verify clearance in your camera enclosure or dome before ordering. Store lenses in a clean, dry environment; dust on the optical surfaces reduces contrast and sharpness.