8mm C-Mount lens for up to 2/3" sensors such as IMX264 and IMX547
8mm C-Mount Lens 2/3" 5MP
The CIL521-F1.5-CMANIR is a fast 8mm C-Mount lens for up to 5MP 2/3" sensors with 3.45um pixel pitch. The aperture is adjustable from F/1.5 to F/16 and the lens has a minimum working distance of 100mm.
In stock — orders before 12 PM PST ship same day
Lens Features
Low F#
A fast maximum F# of F/1.5 for demanding high speed machine vision applications.
Optical and Mechanical Specification Table
| Lens Parameter | Performance Detail |
|---|---|
| Part Number | CIL521 |
| EFL | 8.0 |
| F# | 1.5 |
| Resolution | 5MP, 3.45μm pixel pitch |
| Field of View | 67° @ 11mm — Calculate FoV for your sensor |
| Image Circle | 11.4mm |
| Distortion | '<1%% from Rectilinear |
| Weight | 110g |
| IR Cut-Off Filter | M37x0.5 |
| Construction | All Glass |
Mechanical Layout
Frequently asked questions
What resolution does the CIL521 8mm C-mount lens support?
The CIL521 resolves 5MP at 3.45µm pixel pitch on 2/3″ sensors like the IMX264 and IMX547. At F/2.8, it handles 2.74µm pixel pitch for higher density sensors.
What is the difference between CIL521 CMA and CMR variants?
The CMA variant has an adjustable aperture from F/1.5 to F/16 through a manual iris ring. The CMR variant ships with a fixed aperture, and you choose F/1.5, F/2.0, or F/2.8 at order time. The fixed aperture keeps production settings from drifting.
How much distortion does the CIL521 have?
Distortion is less than 1% from rectilinear. That level is low enough for most automated inspection and machine vision work without software correction.
What is the CIL521 minimum working distance?
The minimum working distance is 100mm. That is closer than most 8mm C-mount lenses, which usually start at 150mm or more, so the CIL521 fits better in tight enclosures.
Does the CIL521 ship same day from the US?
Yes, Commonlands ships in-stock lenses same day from San Diego, California for orders placed before 12 PM PST.
Can I get a 3D model or mechanical drawing for the CIL521?
Yes, a 3D interactive model is on the product page. You can contact engineering@commonlands.com if you need STP files or detailed mechanical drawings.
Similar C‑Mount Lenses: 4mm – 75 mm Industrial Optics
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.