Theia SL183A 5MP Day/Night 1.8-3mm Varifocal Lens

Optimize wide-area security coverage with the Theia SL183A 5MP Day/Night 1.8–3mm varifocal lens. Designed for professional surveillance and monitoring, this varifocal lens uses Theia’s patented Linear Optical Technology® to deliver an ultra-wide 77°–115° field of view without barrel distortion, improving edge-to-edge resolution and increasing the probability of detection. The SL183A supports cameras up to 5 megapixel resolution and a fast f/1.8 aperture, giving clearer images in challenging light. Installers benefit from EasyZoom™ — focus once, then zoom to set magnification with only minor focus fine-tuning — speeding deployment for CCTV and security camera projects. IR correction ensures visible and IR illumination focus on the same plane, so Day/Night cameras remain sharp after nightfall. With a CS mount and professional-grade optics, the SL183A is ideal for perimeter monitoring, retail surveillance, parking lots, and wide-area coverage applications. Upgrade your system for reliable, distortion-free imaging — order the Theia SL183A lens or contact sales to specify it for your next security deployment.

• Ultra‑wide, distortion‑free coverage that increases detection and identification at the edges of the frame
• Patented Linear Optical Technology for rectilinear images and improved edge resolution
• EasyZoom™ varifocal 1.8–3mm adjustment for fast installation and field-of-view optimization
• IR‑corrected design keeps night images sharp when used with Day/Night cameras
• Supports up to 5MP sensors and fast f/1.8 aperture for crisp surveillance in varied lighting