Folded-Optics Cont. Zoom Lens for advanced unmanned aerial systems IR cameras
Introducing the FoldIR 30-450mm f/3.4 continuous zoom lens with Ophir’s innovative folded optical design, offering lightweight, compact design while maintaining long optical lengths and improved tolerance sensitivity. This design ensures exceptional performance even in challenging environments, addressing stabilization and athermalization issues. Its unique f/3.4 aperture guarantees superior image quality, surpassing larger aperture zoom lenses in diffraction limit MTF and IR signal collection. The lens features a built-in mechanical shutter for NUC control, enhancing image quality through Ophir’s control system. Weighting under 2kg, offering an impressive detection range of over 20km, and a horizontal field-of-view of 26.9º (WFOV) and 1.7º (NFOV). This compact, lightweight, long-range, high-performance lens is the ultimate selection of for optical air-land-sea optical gimbals and payloads.
- Efficient folded optics design for min. volume use
- Physical shutter for mechanical NUC performance
- Designed for MWIR 10μm SXGA sensors
- Ideal for air-sea-land gimbals and payloads
- Weight >2kg
- Detection range exceeds 20km
- HFOV 26.9º WFOV/ 1.7º NFOV
- Requires export license
FoldIR 30-450mm f/3.4 Detection, Recognition & Identification (DRI) Range
DRI ranges enable one to easily estimate the maximum range that an object can be either detected, recognized or identified. It is important to note that these estimates are based solely on geometrical parameters – the target size, distance, lens focal length and camera detector pixel size. Signal level, detector sensitivity, atmospheric conditions and other factors are not considered!
The calculations used here are based on the “Johnson Criteria”. According to the Johnson Criteria, the minimum resolution, pixels on target, required to achieve a 50% probability for an observer to discriminate an object are:
- Detection: An object is present – 2 pixels on target (Lower Bar)
- Recognition: discern the type of object, a human vs. a vehicle – 8 pixels on target (Middle Bar)
- Identification: discern specific objects, a man vs. a woman, a car model – 12.8 pixels on target (Upper Bar)