Folded-Optics Continuous Zoom Lens for advanced unmanned aerial systems IR cameras
Introducing the FoldIR 40-450mm f/3.6 continuous zoom lens, featuring Ophir’s innovative folded-optic design for a lightweight, compact form while maintaining long optical lengths and enhanced tolerance sensitivity.
Optimized for MWIR 10μm VGA sensors, it is ideal for space-constrained applications such as unmanned aerial systems (UAS) and gimbal-mounted electro-optical systems, fitting 11” gimbals and other compact platforms.
With a detection range exceeding 21 km, it includes a built-in mechanical shutter for non-uniformity correction (NUC).
Key features
Efficient folded optics design for minimum volume use
Additional CAD file downloads are not available for this product.
foldir-40-450-mm-f-3-6 - Drawings
Additional drawings are not available for this product.
FoldIR 30-450mm f/3.4 Detection, Recognition & Identification (DRI) Range
WFOV (40mm)
Format
Pitch
640x480
10 µm
8.9°
NFOV (450mm)
Format
Pitch
640x480
10 µm
0.85°
Specifications
Focal Length
40-450mm
F/#
3.6
Avg.Trns.
(3.4-4.2μm) 80% (HD) / 76% (HC)
Cold Stop FPA Distance
12mm
Cold Stop Clear Aperture
3.37mm
Minimum Focus Range
50m(WFOV) 5m(NFOV)
Focus Mechanism
Motorized
Focus Time
≤5.5 sec
Zoom Mechanism
Motorized
Zoom Time
<1 sec.
Weight
1.85kg
Dimensions
Ø165 x length 222mm
Drive Voltage
12VDC
Current Consumption
< 0.5A average, 1.0A peak
Communication Interface
RS422
Operating Temperature Range
-32ºC to +75ºC
Storage Temperature Range
-54ºC to +85ºC
Sealing
IP67 front lens only
Features
FoldIR 40-450mm f/3.6 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)
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