In infrared optical system design, the trade-off between zoom ratio and size-weight has always been a challenge. A higher zoom ratio typically demands more lens groups, longer mechanical travel, and greater overall load—until the arrival of the 18-275mm F5.5 HOT19 MWIR Continuous Zoom Lens, which breaks this long-standing constraint. Weighing just 220g, it delivers a 15.3× zoom range with sharp imaging across the entire focal range and rock-solid optical axis stability.

1、15.3× Zoom, Packed into a Φ58mm Body

    From 18mm to 275mm, the 15.3× optical zoom covers a complete focal range from a 29.9° wide-angle to a 2.0° narrow field of view. Conventional designs typically require nearly one kilogram to achieve such optical performance. This lens, however, compresses everything into a Φ58mm × 68.7mm housing with a 95mm optical 2、overall length, weighing just 220g.

    What does 220g mean? It weighs less than a typical smartphone, yet carries the full capability from wide-area search to long-range identification.

3、Lightweight, Without Compromising Image Quality

    Weight reduction does not come at the expense of imaging performance. The lens features a constant F5.5 aperture throughout the zoom range, ensuring consistent light throughput and stable image brightness without abrupt jumps. Paired with a 640×512@15μm detector, or compatible with a 1024×768@10μm high-resolution detector, it delivers detailed, sharp infrared images across the entire focal range. The front lens element is coated with an anti-reflection coating as standard, with hard carbon coating available upon request. With a minimum focusing distance of 5m and support for infinity focus, it captures clear images from near to far.

4、Compact, Without Sacrificing Stability

    The biggest concern with miniaturization is optical axis drift and image jitter caused by insufficient structural rigidity. This lens undergoes rigorous mechanical optimization, ensuring smooth zoom and focus operation with excellent optical axis stability—no image shift or jump throughout the zoom range, maintaining a consistent line of sight when tracking dynamic targets. This is particularly critical for airborne gimbals and vehicle-mounted platforms, ensuring every frame remains clear, sharp, and reliable.

5、-40℃ to +60℃, All-Weather Reliability

    Compactness does not mean fragility. The lens operates reliably across a temperature range of -40℃ to +60℃, with a storage temperature down to -45℃. The front lens element achieves an IP64 protection rating, offering effective resistance against dust, water splash, and sand, ensuring consistent performance whether in freezing snowfields or scorching deserts.

6、Built for Integration

    The 220g lightweight design significantly reduces the load on gimbals, UAVs, and handheld devices. There is no need to upgrade motors or reinforce structures to accommodate this lens—truly enabling a "plug-and-play" integration experience.

7、Summary

    15.3× zoom, 220g weight, Φ58mm diameter, optical axis stability, and full-range clarity—when these keywords converge in a single product, it redefines the portability standard for MWIR zoom lenses. More than just a lens, it is a portable long-range infrared detection capability you can carry anywhere.

    Whether you are seeking an optical solution compatible with specific detectors or need customized lightweight infrared imaging systems for airborne, vehicle-mounted, or handheld platforms, please reach out via the contact information below. The Wh-Clear technical team is ready to provide you with one-on-one support.