F-theta lens 4mm C-Mount lens for 2/3" sensors.
4mm C-Mount F-Theta Lens 2/3" 5MP
The CIL520 is a 4mm C-Mount lens for 2/3" 5MP sensors. The F/1.5 aperture makes this great for wide angle lens applications. Note: this lens does have distortion
Optical and Mechanical Specification Table
| Lens Parameter | Performance Detail |
|---|---|
| Part Number | CIL520 |
| EFL | 4.2 |
| F# | 1.5 |
| Resolution | 8MP, 2.3um |
| Field of View | 153° @ 11.0mm Image Circle. Calculate FoV for your sensor |
| Image Circle | 11.0mm |
| Distortion | 0% F-Θ |
| Weight | 207g |
| IR Cut-Off Filter | Removable |
| Construction | Glass+Plastic |
| Chief Ray Angle | 11.5° |
Mechanical Layout
Frequently asked questions
What sensors does the CIL520 4mm C-mount lens support?
The CIL520 is listed for 2/3 inch sensors up to 5MP. The focal length is 4mm and the aperture is F/1.5.
What part number is listed for the CIL520?
The page lists CIL520-F1.5-CMANIR, described as F/1.5, without filter, C-Mount A.
Is the CIL520 an M12 lens?
No. The CIL520 is a C-mount lens. Use it with cameras that support a 1 inch-32 C-mount thread and the normal 17.526mm C-mount flange distance.
Does the CIL520 have distortion?
Yes. The product note says the lens does have distortion. Measurement systems should calibrate the image instead of assuming rectilinear geometry.
Does the CIL520 include an IR cut filter?
No. The listed part number is the ANIR version, which means without filter.
Does the CIL520 ship same day from the US?
Yes. In-stock orders placed before 12 PM PST ship same day from the Commonlands San Diego warehouse.
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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.