72.5mm C-Mount lens for up to 1.2" sensors such as IMX530
75mm C-Mount Lens 1.2" 25MP
The CIL557 is a 72.5mm C-Mount lens for up to 25MP 1.2" sensors with 2.74um pixel pitch. IMPORTANT NOTE: This Lens has working distance range of 500mm-1600mm ONLY; you can use it at closer distances using a C-mount spacer but cannot use it at infinity.
In stock — orders before 12 PM PST ship same day
Lens Features
Adjustable Aperture
Adjustable F3.0-F/15+ aperture to optimized depth of field of your system.
Large Format Size
Suitable for up to 1.2″ or larger (4/3″) sensors.
Optical and Mechanical Specification Table
| Lens Parameter | Performance Detail |
|---|---|
| Part Number | CIL557 |
| EFL | 72.5 |
| F# | 3.0 |
| Field of View | 15.2° @ 19.3mm image circle — Calculate FoV for your sensor |
| Image Circle | 19.3mm |
| Distortion | -0.02% TV |
| Weight | 138g |
| Construction | All Glass |
Frequently asked questions
What sensors work with the CIL557 75mm C-mount lens?
The CIL557 fits 1.2″ format sensors with 2.74µm pixel pitch at 25MP. The Sony IMX530 is a direct match, and the 19.3mm image circle also covers smaller formats like 2/3″ and 1.1″ with a narrower field of view.
Why does the CIL557 only focus from 500mm to 1600mm?
The CIL557 is optimized as a finite conjugate lens for 500mm to 1600mm working distance. That is a deliberate optical choice for inspection and metrology, and C-mount spacer rings can shift the range closer. The lens cannot focus at infinity.
How much distortion does the CIL557 75mm lens have?
TV distortion is -0.02%. That is essentially zero, so the lens is suitable for dimensional gauging and measurement where geometric accuracy matters.
Can I use the CIL557 on a CS-mount camera?
Yes, any C-mount lens works on a CS-mount camera with a 5mm spacer adapter to account for the flange distance difference. Optical performance does not change.
Does the CIL557 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 add a filter to the CIL557?
Yes, the CIL557 accepts M30.5x0.5 threaded filters, so you can add IR cut filters, bandpass filters, or polarizers directly to the lens barrel.
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.