2.5mm CS-Mount Fisheye Lens for Raspberry Pi HQ and up to 2/3" Sensors

The CIL725 is a 2.54mm CS-mount fisheye lens with 190° field of view on a 6.4mm image circle. It opens to F/1.8 and uses a manual iris down to F/14, so you can trade light for depth of field instead of being locked into one setup. All-glass, all-metal construction brings the weight to 81g, which is heavier than a board lens but normal for a CS-mount fisheye that covers this much angle.

On 2/3" sensors the lens produces a full circular 190° fisheye image. On 1/2.3" sensors like the Raspberry Pi HQ Camera with IMX477, it gives 190° horizontal coverage. Distortion is -9% F-Θ, which follows standard fisheye projection closely enough that dewarping software behaves predictably. The lens resolves 12MP at the widest aperture, and stopping down to F/2.4 raises resolving power to 14MP+ on high-density sensors.

Manual focus lets you set the working distance instead of accepting a factory default. The CS-mount thread goes straight onto any CS-mount camera. Raspberry Pi HQ, FLIR Blackfly S, iDS uEye, Allied Vision, Basler Dart, and The Imaging Source boards are mechanically compatible. The Commonlands CLA024 adapter works for M12-based camera boards, and other compatible mounts are available.

This is the fisheye to use when you need circular coverage for 360° stitching rigs, room-scale monitoring, or hemispherical inspection. You can check sensor coverage the field of view calculator.

Commonlands ships this lens same day from San Diego before 12 PM PST.