Compare Model Drawings, CAD & Specs Availability Price
680314-001
LightIR 20-275mm f/5.5
MWIR Continuous Zoom Lens, LightIR, 20-275 mm FL, f/5.5, High Durability
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 680314-001 LightIR 20-275mm f/5.5 MWIR Continuous Zoom Lens, LightIR, 20-275 mm FL, f/5.5, High Durability
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680314-002
LightIR 20-275mm f/5.5
MWIR Continuous Zoom Lens, LightIR, 20-275 mm FL, f/5.5, Hard Carbon
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 680314-002 LightIR 20-275mm f/5.5 MWIR Continuous Zoom Lens, LightIR, 20-275 mm FL, f/5.5, Hard Carbon
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680314-003
LightIR 20-275mm f/5.5
MWIR Continuous Zoom Lens, LightIR, 20-275 mm FL, f/5.5, High Durability, with folded control card
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 680314-003 LightIR 20-275mm f/5.5 MWIR Continuous Zoom Lens, LightIR, 20-275 mm FL, f/5.5, High Durability, with folded control card
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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
    -35°C to +65°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.

High-durability and Hard-carbon AR Coatings

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

Resources

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