191° Fisheye Lens S-Mount for 10-12MP Sensors
191°@6.4mm Fisheye Lens
The CIL281 is a 1.95mm EFL M12 Fisheye lens which provides 200°@6.4mm image circle. The fast F/1.8 and ingress protection make this lens great for surveillance and robotics applications.
In stock — orders before 12 PM PST ship same day
Lens Features
191° FoV
Maximize your camera's viewing angle with a 191° field of view.
Low F#
An F/1.8 lens for great performance in low light
IP67
IP67+ rated for dust and water resistance
Optical and Mechanical Specification Table
| Lens Parameter | Performance Detail |
|---|---|
| Part Number | CIL281 |
| EFL | 1.95 |
| F# | 1.8 |
| Resolution | 10-12MP, 1.55μm |
| Field of View | 191° @ 6.4mm image circle — Calculate FoV for your sensor |
| Image Circle | 6.4mm |
| Distortion | -1% F-Θ |
| Weight | 13g |
| IR Cut-Off Filter | NIR |
| Construction | Glass, AL6061 |
Mechanical Variants
| Variant | Description |
|---|---|
| M12A | Detail |
Mechanical Layout
Camera Mechanical Compatibility Table*
| Camera/Mount | Compatibility |
|---|---|
| Commonlands CLA018 | 9mm-13mm tall mount |
| e-con Systems Standard S-Mount | Yes |
| Allied Vision Alvium S-Mount | Yes |
| FLIR Dragonfly S USB3 | Rev1.1: Yes, Rev1.2: Must order PN ending C-NO |
| iDS uEye LE | Yes |
| The Imaging Source M12 | Contact D3 Engineering |
| D3 Camera Modules | — |
*Mechanical compatibility only, assuming the standard M12x0.5 lens mount provided by the camera manufacturer. Please check optical compatibility separately.
Frequently asked questions
What sensor sizes can CIL281 cover?
CIL281 covers sensor formats from 1/2.3″ to 2/3″. That gives you room to use the same lens across several higher-resolution sensor families.
How much resolution does CIL281 support?
The lens is rated for 10-12MP sensors with 1.55μm pixels. That makes it a good fit when you need fisheye coverage on modern high-density imagers.
Why is the -1% F-Theta distortion spec important?
The -1% F-Theta spec means the lens keeps angular mapping very close to ideal for a fisheye. That helps when you need stable calibration, perception, or multi-camera stitching.
Is CIL281 a good low-light option?
Yes. The F/1.8 aperture passes more light than slower ultra-wide lenses, so you get shorter exposure times or lower gain in dim scenes.
What is the image circle of CIL281?
CIL281 uses a 6.4mm image circle. That is what lets it cover formats up to 2/3″.
Is CIL281 sealed for exposed environments?
Yes. The listed M12A version is IP67 rated and uses BBAR on lens 1 surface 1.
Similar Fisheye
About Commonlands
Commonlands LLC designs and manufactures precision M12, C-mount, and M8 lenses for machine vision, robotics, and embedded camera systems. Based in San Diego, California, we stock inventory for same-day shipping and provide direct access to US-based optical engineers. Whether you need a single prototype lens or production volumes of 25,000+, our team supports the full lifecycle from optical design consultation through volume fulfillment.
Need help selecting the right lens for your camera module?
Contact our US-based Optical Engineers.