640×512 MWIR Motorized Zoom Lens

Overview

Specification

Field of View

Size

Lens Date

High/Low Temp Optical Performace

Parameter Description

FAQ

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640×512 MWIR Motorized Zoom Lens

The MWIR motorized zoom lens is specifically optimized for high-resolution detectors with a 640×512 format and 15μm pixel pitch. It operates in the 3.7 microns to 4.5 microns spectral band. The lens features a motorized zoom mechanism, is compatible with a designated lens controller, and supports RS232/RS422 communication protocols. Offering significant advantages in thermal imaging, surveillance, and industrial inspection, it serves as a critical component for advanced thermal cameras.

Ranging from 18–275mm to 80–1200mm, meeting diverse application needs from long-range detection to wide-area search.
Maintains sharp image quality across the entire zoom range without defocusing.
Average transmittance of ≥69%–80% effectively ensures thermal imaging sensitivity.
Distortion is controlled within 1%–5% across focal lengths, facilitating target positioning and measurement.
Stable operation from –40°C to +80°C, adaptable to temperature variations.
The front of the lens is rated IP67 capable of withstanding harsh weather conditions.

Adaptive detector	640×512×15μm
Operating wavelength band	3.7-4.8μm
Thermal adjust	Motorized Adjustment
Sealing	IP67(front only)
Lens Control	Designated lens controller
Supply Voltage	12V (Can be configured to 6V- 12V)
Current Consumption	0.5A average, 1.0A peak at T= – 30℃; 0.2A average, 1.0A peak at T ≥ 20℃
Operating Temperature	-40℃~+80℃
Communication Protocol	RS232/RS422

		Focal Length	FOV H	FOV V
MW300S	WFOV	f15mm	35.4°	28.7°
MW300S	NFOV	f300mm	1.8°	1.4°
MW275S	WFOV	f18mm	31.7°	2.3°
MW275S	NFOV	f275mm	24.4°	1.8°
MW550S	WFOV	f30m	18.18	14.59
MW550S	NFOV	f550mm	1	0.8
MW600S	WFOV	f30mm	18.1°	14.5°
MW600S	NFOV	f600mm	0.91°	0.73°
MW900S	WFOV	f45mm	12.17°	9.75°
MW900S	NFOV	f900mm	0.61°	0.48°
MW1200S	WFOV	f80mm	6.92°	5.54°
MW1200S	NFOV	f1200mm	0.70°	0.55°
MW360S	WFOV	f40mm	14.93	12.04
MW360S	NFOV	f360mm	1.53	1.22

MWIR Motorized Lens Size

AS MW275S Size

AS MW300S Size

AS MW360S Size

AS MW550S Size

AS MW600S Size

AS MW900S Size

AS MW1200S Size

MW275S Motorized Zoom Lens

MW275S MTF

MW275S Dot Chart

MW275S Field Curvature Distortion

MW275S Relative Illumination

MW300S Motorized Zoom Lens

MW300S MTF

MW300S Dot Chart

MW300S Field Curvature Distortion

MW300S Relative Illumination

MW360S Motorized Zoom Lens

MW360S MTF

MW360S Dot Chart

MW360S Field Curvature Distortion

MW360S Relative Illumination

MW550S Motorized Zoom Lens

MW550S MTF

MW550S Dot Chart

MW550S Field Curvature Distortion

MW550S Relative Illumination

MW600S Motorized Zoom Lens

MW600S MTF

MW600S Dot Chart

MW600S Field Curvature Distortion

MW600S Relative Illumination

MW900S Motorized Zoom Lens

MW900S MTF

MW900S Dot Chart

MW900S Field Curvature Distortion

MW900S Relative Illumination

MW1200S Motorized Zoom Lens

MW1200S MTF

MW1200S Dot Chart

MW1200S Field Curvature Distortion

MW1200S Relative Illumination

MW275S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

MW360S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

MW600S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

MW1200S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

MW300S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

MW550S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

MW900S Optical Performance at High/Low Temp

high temperature 80°C

low temperature -40°C

Focal Length

Focal length refers to the distance between the optical center (rear principal point) of a lens and its imaging focal point, serving as a key performance parameter of the lens. It determines the angle of view: the shorter the focal length, the wider the field of view and the broader the observable range; the longer the focal length, the narrower the field of view and the more concentrated the observation area.

F-number

The F-number is a key parameter indicating the light-gathering capacity of mid-wave infrared (MWIR) lenses, defined as the ratio of the lens focal length to its clear aperture. The F-number directly determines system sensitivity, signal-to-noise ratio and imaging quality. A smaller F-number stands for a larger aperture, higher light throughput and shallower depth of field.

When F-number ≤ 2.0, the lens achieves high light throughput, superior sensitivity and high signal-to-noise ratio, and is widely used in scientific research detection of weak signals.
When F-number ≥ 5.5, the light intake is limited, and such lenses are generally applied to long-focal-length long-distance observation.
F-numbers between the above two values are the mainstream choice for most mid-wave infrared lenses, offering an ideal balance among light-gathering performance, production cost and depth of field.

Generally, under a fixed focal length, a smaller F-number requires a larger lens aperture, which results in a bulkier lens body, heavier weight and higher cost.

Angle of View (AFOV)

Angle of View is a core parameter representing the observable range of a mid-wave infrared (MWIR) lens, referring to the horizontal or vertical angular coverage captured by the lens. The magnitude of the angle of view is jointly determined by the lens focal length and the detector target size.

Calculation formula:

AFOV = 2 × arctan( H / 2f )

AFOV: Angle of View
H: Detector target dimension (length in horizontal or vertical direction)
f: Lens focal length

With a fixed detector dimension (H), a shorter focal length (f) yields a larger angle of view (AFOV).

With a fixed focal length (f), a larger detector target dimension (H) also delivers a wider angle of view (AFOV).

Transmittance

Transmittance is a key optical parameter for measuring the efficiency with which a mid-wave infrared (MWIR) lens transmits infrared radiation, usually expressed as a percentage (%). It directly determines the signal intensity reaching the detector and ranks among the core indicators affecting imaging quality.

A higher transmittance means less loss of infrared energy passing through the lens, delivering better signal-to-noise ratio (SNR) and image contrast. Transmittance is defined as the ratio of the radiant flux exiting the optical system (lens) to the incident radiant flux.

The average transmittance of mid-wave infrared (MWIR, 3–5 μm) lenses generally ranges from 70% to 95%.

Well-designed lenses typically require a transmittance of ≥ 85%.

Distortion

Distortion is a critical parameter for evaluating the geometric fidelity of mid-wave infrared (MWIR) lens imaging. It refers to the deviation between the actual imaging position on the image plane and the theoretical ideal position, generally expressed as a percentage (%).

The root cause of distortion lies in the inconsistent magnification of the lens for light rays at different fields of view (FOVs). An ideal lens delivers a constant magnification across the entire image plane. However, constrained by optical design, real-world lenses feature mismatched magnification between the edge and central fields of view, resulting in image deformation.

Prime lenses are typically optimized for superior distortion control, boasting ultra-low distortion of less than 0.5%.

Zoom lenses adopt complex lens assemblies, making distortion suppression more challenging, with distortion usually kept within 5%.

Depth of Field

Depth of field refers to the axial range in front of and behind the focused plane within which objects can still appear acceptably sharp in an image. This range includes the front depth of field (the clear zone in front of the focal plane) and the rear depth of field (the clear zone behind the focal plane). The sum of these two zones constitutes the total depth of field

Three primary factors influence depth of field: aperture size, working distance, and lens focal length. Increasing the depth of field can be achieved by:

Reducing the aperture size (i.e., using a larger f-number)
Increasing the working distance
Using a lens with a shorter focal length

Q1 : What is SWIR?

The word SWIR is an acronym meaning Short Wavelength InfraRed, also frequently referred to as shortwave infrared. SWIR generally refers to the wavelength band of light between 900nm and 2500nm.

Q2 : What exactly is a Short-Wave Infrared (SWIR) lens and how does it work?

A SWIR lens is an optical lens specifically designed to focus light in the short-wave infrared spectrum, typically between 0.9 and 1.7 micrometers (µm). The lens works by collecting SWIR light reflected from objects and converging it onto a specialized sensor, such as an Indium Gallium Arsenide (InGaAs) detector, which then converts the photoelectric signal into a grayscale image.

Q3 : Why can't I just use a standard visible-light lens for SWIR imaging?

While it is physically possible to mount a visible lens on a SWIR camera, the image quality will be severely compromised. Standard optical glasses and anti-reflective coatings are optimized for the visible spectrum (400-700nm). When used for SWIR, these lenses suffer from significant optical aberrations, particularly chromatic aberration, and a sharp decrease in resolution. This happens because the glass elements fail to focus the longer SWIR wavelengths to the same point, resulting in a blurred image. A true SWIR-optimized lens uses special glass types and coatings to ensure all SWIR wavelengths focus correctly, delivering high contrast and resolution.

MWIR Zoom Lenses for Thermal Imaging Camera

Attostek’s MWIR lenses are specifically designed to capture radiation in the mid-wave infrared band, delivering reliable, high-contrast imaging. The MWIR motorized zoom lens are ideally suited for industrial inspection, including real-time thermal fault detection in power equipment, hotspot monitoring in photovoltaic panels, and temperature distribution analysis in metallurgical processes. For scientific research, it supports studies of material thermodynamics and thermal field recording. In traffic management, the lens facilitates nighttime vehicle identification, tunnel fire early warning, and condition monitoring of railway transport equipment.

Model	MW275S	MW300S	MW360S	MW550S	MW600S	MW900S	MW1200S
Focal Length	f18mm-f275mm	f15mm-f300mm	f40mm-f360mm	f30mm-f550mm	f30mm-f600mm	f45mm-f900mm	f80mm-f1200mm
F.NO	5.5	4		5.5	4
Relative Illumination	＞82%	≥84%	≥80%	≥82%	＞84%		＞80%
Distortion	18mm≤\|3.94\|% 275mm≤\|1\|%	≤\|5\|%	40mm≤\|1\|% 360mm≤\|2\|%	30mm≤\|1\|% 550mm≤\|2.9\|%	≤\|5\|%	45mm≤\|5\|% 900mm≤\|1\|%	≤\|5\|%
(Focal Range) F.R	10m/30m~Infinity		10m/50m~Infinity	5m/50m~Infinity	10m/30m~Infinity
(Optical total length) TTL	95mm	137mm	189.2mm	135mm	230mm	358.9mm	415.6mm
Tave	≥80%	≥78%	≥80%	≥80%	≥72%	≥69%	≥79%
MD	54mm	80mm	96mm	100mm	162mm	282mm	334mm
Weight	30g	179.1g	268g	/	1038.9g	3354.27g	12kg
B.F.L	26.2mm	30.06mm	32.75	27.4mm	29.907mm	29.938mm	30.06mm
Cold stop distance	19.1mm	19.95mm		19.7mm	19.95mm
Cold stop CA	Ø3.5mm	Ø20mm	Ø5mm	Φ3.58mm	Ø5mm