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Home / Thermal, SWIR & UV lenses / LWIR Thermal lenses
4.3 mm, F1.2 LWIR Thermal Lens (LS-SLWIR81)

Thermal, SWIR & UV lenses

4.3 mm, F1.2 LWIR Thermal Lens (LS-SLWIR81)

Model LS-SLWIR81

4.3 mm, F1.2 LWIR Thermal Lens. Long-wavelength infrared (LWIR) thermal lenses designed for commercial and military applications. At a glance: focal length 4.3 mm; sensor 256×192 12μm; aperture F1.2; mount M9×0.25; distortion 4.9%.

$129.00 USDIn stock · 3 available

Inventory updated Oct 14, 2026

0.10 kg shipping weight · Ships in 2-3 weeks
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Specifications

ModelLS-SLWIR81
Focal length4.3 mm
ApertureF1.2
Sensor256×192 12μm
Angle of view (deg)50.28°(D)×40.22°(H)×30.32°(V)
Distortion4.9%
Relative illumination0.82
Focus methodFixed
Focus range0.1m~∞
Mechanical back focal length2.575 mm
MountM9×0.25
Dimensionsdia. 9 x L5.3 mm
Operating temperature40℃ to +80℃
Weight<1g
SealingIP 67
Front lens coatingHD
Shipping weight (estimated)0.10 kg

Photo shows a representative model of this series; see the specifications for this model.

Applications

  • Commercial
  • Military
Complete the station

Drive the light from a light controller and pair it with a lens for your field of view and working distance.

Light controllers LensesSelection guide

Other sizes in the LWIR Thermal lenses series

ModelSizePriceAvailability
LS-UNNAMEDINTERNALLISTROW73.1 mm, F1.1 $119.00 2 in stockView
LS-SLWIR423.5 mm, F1 $119.00 3 in stockView
LS-STRFA66K5L13.5 mm, F1.0 $119.00 5 in stockView
LS-STRLW49L12.64 mm, F1.1 $119.00 4 in stockView
LS-LIR0061-0H3.7 mm, F1 $129.00 4 in stockView
LS-SLTR38106403.8 mm, F1.0 $129.00 2 in stockView
LS-SLTR44108004.4 mm, F1.0, M45x1-mount $129.00 5 in stockView
LS-SLTR46106404.6 mm, F1.0 $129.00 4 in stockView
LS-SLWIR554 mm, F1 $129.00 3 in stockView
LS-SLWIR594 mm, F1 $129.00 5 in stockView
LS-SLWIR643.7 mm, F1.2 $129.00 5 in stockView
LS-SLWIR684 mm, F1.2 $129.00 4 in stockView
LS-SLWIRF84.5 mm, F1.2 $129.00 5 in stockView
LS-STRLW28L13.7 mm, F1.1, M9x0.5-mount $129.00 4 in stockView
LS-STRLW41L13.7 mm, F1.1 $129.00 3 in stockView
LS-SLTR55103845.5 mm, F1.0, Flange-mount $139.00 2 in stockView
LS-SLTR56108005.6 mm, F1.0, M45x1-mount $139.00 3 in stockView
LS-SLWIR934.8 mm, F1.2 $139.00 3 in stockView
LS-SLWIRE94.8 mm, F1 $139.00 4 in stockView
LS-SLWIRF95.3 mm, F1.2 $139.00 5 in stockView
LS-STRLW15L15 mm, F1.2 $139.00 3 in stockView
LS-STRLW15L25 mm, F1.2 $139.00 4 in stockView
LS-UNNAMEDINTERNALLISTROW86.2 mm, F1.1 $149.00 5 in stockView
LS-LIR0037-0G6 mm $149.00 3 in stockView

See all 194 models in the LWIR Thermal lenses series