High-resolution camera lens XRE 35

Overview
The XRE 35 Lens is a near-eye display test solution with electronic focus. Its patent-pending optical design is engineered to measure near-eye displays integrated into virtual (VR), mixed (MR), and augmented reality (AR) headsets by simulating the size, position, and field of view of the human eye. The lens supports folded ("periscope") and non-folded configurations and can be used for single-eye or dual-eye (stereoscopic) measurement when two systems are integrated.

Key Capabilities

• Replicates human eye position in XR headsets
• Electronic focus controllable by software (internal focus mechanism; body length does not change during focus)
• Folded ("periscope") and non-folded configurations to fit diverse headset form factors
• Field of view up to ±35° (70° total)
• Supports through-focus automated MTF analysis (multiple focus settings iterated in software)

Flexible Configurations
The XRE 35 Lens can be paired with imaging photometers (photometric) or imaging colorimeters (colorimetric) and supports resolution options to provide required pixels-per-degree for up to 70° FOV. Folded configurations enable measurement in headsets with limited eye relief or headgear and can allow two XRE 35 Lens systems to be installed for simultaneous left- and right-eye measurement.

Measurement and Software Integration
The XRE 35 Lens attaches to Radiant ProMetric imaging photometers or colorimeters using a custom mounting bracket to form a compact camera/lens solution. It is supported by Radiant's TrueTest™ software and the TT-ARVR™ software module for automated AR/VR display tests (luminance, chromaticity, contrast, uniformity, mura/blemish detection, pixel/line defects, MTF, distortion, focus uniformity, etc.).

Resources
A specification sheet (product spec PDF) is available for this product (see product documents).

Characteristics / technical specifications

• Primary application: Light and color measurement for near-eye displays (NED) in headsets
• Effective aperture (entrance pupil): 3.3 mm
• Focus: Electronic (software-controllable internal focus)
• Focus distance: Range 0.5 m to infinity (measured from front of lens)
• Minimum inter-pupillary distance (IPD): 63 mm
• Fold length of optional fold mirror: 173 mm
• Luminance - minimum: 0.01 cd/m2
• Luminance - maximum: 10,000 cd/m2 (Y-series cameras); 1,000,000 cd/m2 (I-series cameras) — maximum values for short exposures
• Measurement capabilities: Luminance, Radiance, CIE chromaticity coordinates, Correlated Color Temperature (CCT)
• Units supported: cd/m² (nit), W/sr/m², foot-lambert, CIE (x, y) and (u', v'), Kelvin (CCT)
• Paired camera options: ProMetric Y61; ProMetric I61 / I61-SC
• Approximate field of view (horizontal): ±35°
• Approximate field of view (vertical): ±35°
• Resolution: ~0.012° per sensor pixel (dependent on camera/resolution option)
• Resolution options (system): 29 MP, 45 MP, 61 MP (camera-dependent)
• Lens configuration options: Folded ("Periscope") or Non-Folded
• Additional solutions: Standard single-lens solution or dual-eye solution (two integrated XRE systems)
• System recommendations: High-resolution ProMetric imaging photometer or colorimeter (up to 61 MP), TT-ARVR™ software module, Windows 10 (64-bit), 16–32 GB RAM; additional system requirements vary by camera