The LightIR 20-275mm f/5.5 at only 264 g, this is the smallest, most lightweight continuous zoom lens on the market, with long-range capabilities of up to 14.9 km detection range. Featuring an innovative and unique optomechanical design and focus movement. The end result is the highest thermal imaging performance on the market, ideal for stabilized payloads in a variety of drones, UAVs, and handheld devices for SWaP applications.
Smallest, most lightweight continuous zoom lens on the market
Long-range capabilities of up to 14.9 km detection range
Unique optomechanical design and focus movement
High-durability and low reflection hard-carbon 3-5 µm wavelength AR coatings
Additional drawings are not available for this product.
WFOV (20 mm)
Format
Pitch
640x512
15 µm
28.0°
NFOV (275 mm)
Format
Pitch
640x512
15 µm
1.9°
Specifications
Type
Continuous Zoom
Focal Length
20 to 275 mm
F/#
5.5
Spectral Range
3.4 to 5.0 μm
Cold Stop FPA Distance
19.7 mm
Cold Stop Clear Aperture
Ø3.52 mm
Back Focal Length
23.52 mm in air
Minimum Focus Range
5 m Wide, 50 m Narrow
Nuc (by defocus)
Yes
Focus Mechanism
Motorized
Focus Time
≤8 s
Zoom Mechanism
Motorized
Zoom Time
≤5 s
Through-zoom Boresight
Within a radius of 0.15 mm at the focal plane
Weight
264 g
Dimensions
Ø58 mm x 67.1 mm
Drive Voltage
12 VDC
Current Consumption
0.2 A average, 1.0 A peak
Communication Interface
RS485, RS422
Operating Temperature Range
-32°C to + 70°C
Storage Temperature Range
-40°C to +80°C
Sealing
IP 67 front element only
Wavelength Region
MWIR
Features
LightIR 20-275mm f/5.5 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)
High Performance Mid-Wave Focal Plane
Using advanced technologies, top-quality materials and unique coating techniques, together with innovative engineering and opto-mechanical designs, we have earned a reputation for excellent performance, durability and quality.
Our highly abrasion-resistant, anti-reflective advanced optical coatings include several types of Hard Carbon coatings which provide maximum durability, energy transmission & minimal reflection. Our innovative coating technologies include:
Physical Vapor Deposition (PVD) – Thermal heating and electron gun
Ion Assisted Deposition (IAD) – Ion gun
Plasma Enhanced Chemical Vapor Deposition (PECVD) for DLC coatings
Passive Athermalized Lens Assembly
Our IR imaging lens assemblies incorporate passive athermalization of the lenses and opto-mechanical system to maintain the highest imaging performance over the full operating temperature range. We use advanced materials that enable unique athermalization properties and optomechanical designs that effectively compensate for optical variations over a wide temperature range.
IR Optics Production Site Virtual Tour
Ophir LightIR 20-275mm f/5.5 MWIR lens, integrated with Markos 640 by i3 Systems
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