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Night Vision Objective & Eyepiece Lenses
Introvision manufacture a range of optics
for Night Vision Goggles.
The units can be provided to Military or civil standards.
Specifications
Eyepiece Performance Details
| Field of view: |
47 degrees onto 18mm format |
| Exit Pupil Distance: |
47 degrees at 25mm
40 degrees at 35mm |
| Focus Accommodation: |
Designed for use at -1.5 dioptres |
| Focal Length: |
23.70 +- 0.47mm |
| Distortion at 20° field: |
pincushion 8.0% +-1 % to match barrel distortion of
8.0% of Objective |
| Spectral Response: |
Corrected for P20 Phosphor and Photopic response |
| Design Pupil size: |
5mm diameter |
| Effective pupil eyebox: |
20mm diameter |
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Field Curvature and Astigmatism at minus
1.5 dioptres setting:
| Centred pupil: |
less than 0.5 dioptres over the whole field with astigmatism
less than 0.3 dioptres |
| Pupil offset of 5mm: |
less than 0.5 dioptres over the whole field with astigmatism
less than 0.5 dioptres |
| Pupil offset of 8mm: |
less than 0.75 dioptres over the whole field with astigmatism
less than 0.5 dioptres |
| Dioptre adjustment range: |
-3 dioptres to +1 dioptres |
| Nominal Accommodation Setting: |
-1.5 Dioptres |
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Objective Performance Details
| Field of View: |
47 degrees onto 18mm format |
| Focal Length: |
23.70 +- 0.47mm |
| Distortion at 200 field: |
barrel 8.0% +-1% |
| Spectral Response: |
Compatible with GEN 3 or GEN 2 tubes with integral
645 or 665 cut filter for cockpit compatibility. |
| Veiling Glare: |
less than 3% |
| Relative Illumination: |
At full aperture, the image illuminance at 17.75mm
is not less than 40% of the image illuminance on axis. |
| Focus Range: |
Infinity to 1 metre or fixed focus option |
| T-Number: |
T/1.30 |
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Reduced Specification Optic
As above, except
| Exit Pupil Distance: |
47 degrees at 25mm
40 degrees at 35mm |
| T-Number: |
T/1.30 |
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Symbology Injection for NVG Introvision also manufacture a
retrofit for Night Vision Goggles to allow symbology and video
into the pilot’s eye. This can be fitted to current Night
Vision Goggles already in service or to Introvision ultra
lightweight goggles with 47 degrees F.o.V with large exit
pupil distance. Fits most NVG Systems
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