New FOLDIR 25-275mm f/5.5 Low-SWaP Cont. Zoom Lens

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Overview

Designed for 15μm VGA FPA detectors, fitted for 5” (127mm) gimbal size

The FoldIR 25-275mm MWIR f/5.5 continuous zoom lens, the latest addition to the FoldIR family of lightweight lenses designed specifically for drones and UAV’s, offering a cutting-edge solution for the newly released low-SWaP 15μm VGA MWIR detectors.

With a total volume size 107mm x 101.5mm x 96mm (including detector) and weighing only 302 gr. net (360gr including detector), this lens is one of the most compact and lightweight options in the market today.

Optimized for use with low-SWaP 15μm pitch VGA FPA detectors in 5” gimbals, the FoldIR 25-275mm f/5.5 lens offers exceptional performance and versatility for thermal imaging applications.

Key features:

Weighs 302gr
Efficient folded optics design for minimum volume use with total volume size of 107mm x 101.5mm x 96mm including detector
Designed for MWIR 15μm VGA detectors
Detection range exceeds 14.5km*
Ideal for 5” (127mm) small size aerial gimbles

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		Compare	Model	Compatibility	sortOrder	rankScore	ranking	Drawings, CAD & Specs		Format	Pixel Pitch	Focal Length	F/#	Availability	Featured Item	Price		Brand
		New 680520-001 FOLDIR 25-275mm f/5.5 FOLDIR 25-275mm f/5.5, High Durability Contact Us	New 680520-001 FOLDIR 25-275mm f/5.5 FOLDIR 25-275mm f/5.5, High Durability	UNIVERSAL	0.0	1.0	0.0		0.0	640X480	15 μ	25-275mm	5.5	Contact Us	New			Ophir

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WFOV (25mm)

	Format
Pitch	640x480
15 µm	23.4°

NFOV (275mm)

	Format
Pitch	640x480
15 µm	2.0°

Specifications

Type

Continuous Zoom
Focal Length

25-275mm
F/#

5.5
Cold Stop FPA Distance

19.4mm
Cold Stop Clear Aperture

Ø3.6mm
Back Focal Length

23.37mm in air
Minimum Focus Range

WFOV:50m;NFOV:5m
Nuc (by defocus)

Yes
Focus Mechanism

Motorized
Focus Time

≤8sec

Zoom Mechanism

Motorized
Weight

302 g
Dimensions

Ø60x96x84.2mm
Drive Voltage

12V
Current Consumption

<0.5A average, 1.0A peak
Communication Interface

RS485, RS422
Operating Temperature Range

-32ºC to +71ºC
Storage Temperature Range

-40ºC to +80ºC
Sealing

IP67 front element only
Wavelength Region

MWIR

Features

FOLDIR 25-275mm 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)

^{Note: Calculations used are based on “Johnson Criteria” | Real world performance may vary depending on the weather conditions. Assumptions: 23mK NETD (f/5.5) for MWIR cooled detectors | 30Hz frame rate | 50% detection probability | 0.2km-1 atmospheric attenuation coefficient | human ΔT = 5°C | vehicle ΔT = 2°C}

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.