Arducam LN039 8mm CS Mount Lens for Raspberry Pi HQ Camera

While the lens is physically a CS mount, its field of view is optimized for the Raspberry Pi HQ Camera's larger sensor. On the smaller V1/V2 camera sensors, the horizontal field of view reduces to approximately 30°, which may result in significant vignetting or a cropped image circle. It is recommended primarily for use with the Raspberry Pi HQ Camera or other CS-mount modules with a 1/2.3-inch sensor format for full performance.

The lens features two adjustable rings. Rotate the front ring to manually adjust focus, turning it to bring subjects from the minimum distance of 0.2 meters into sharp focus at infinity. The rear ring controls the aperture; turn it to open or close the iris, changing the F-stop to control the amount of light entering the sensor and the depth of field. Always make adjustments while monitoring the live image feed from your Raspberry Pi for precise results.

The fast F1.2 aperture allows significantly more light to reach the camera sensor compared to standard lenses. This is crucial for Raspberry Pi vision projects operating in low-light environments, such as indoor surveillance or nighttime monitoring, as it improves image brightness and reduces sensor noise. Additionally, the wide aperture enables a shallow depth of field, useful for isolating subjects in machine vision applications or creating cinematic blur effects in photography.