Theia SL940A 1/3" F1.5 DC Varifocal Lens, 9-40mm, CS Mount, Black

Optimized for long-range security and discreet surveillance, the Theia SL940A varifocal lens delivers reliable, high-quality imaging for professional monitoring applications. This Theia lens offers a 9-40mm focal range and a bright f/1.5 aperture, enabling integrators to capture distant subjects with improved clarity and low-light sensitivity. Built for HD and multi-megapixel systems, the SL940A supports up to 5MP resolution and maintains sharp edge-to-edge detail across the field of view.

IR-corrected optics ensure that artificial infrared illumination focuses on the same plane as visible light, so your day/night cameras stay in focus when switching to night mode—eliminating the soft or blurred nighttime images common with non-corrected lenses. The CS mount and 1/3" format make the lens simple to install in a wide range of surveillance cameras used in perimeter, parking lot, transportation, and critical infrastructure monitoring.

Choose the Theia SL940A for dependable telephoto performance in security, surveillance, and monitoring deployments—ideal for projects that require long-range detail and consistent day/night image quality. Order today or specify the SL940A for your next installation.

• Capture distant detail with confidence: 9-40mm telephoto range for unobtrusive long-range surveillance
• Brighter images in low light: fast f/1.5 aperture improves performance and reduces noise for clearer monitoring
• True day/night performance: IR-corrected optics keep night images in focus when using IR illumination
• Preserve high-resolution detail: Designed to support up to 5MP cameras for crisp edge-to-edge imaging
• Easy integration: CS mount and compact 1/3" format simplify installation on a wide range of security cameras