QDEF TECHNICAL // NIGHT VISION OPTICS
NIGHT VISION
GLASS GUIDE
MBS ULR. Mil-Spec Noctis/NVD. RPO Ultralight. Compare the weight, construction, optical characteristics, and practical benefits of the glass we offer.
YOUR TUBES ARE ONLY PART OF THE PICTURE
Image intensifier specifications get most of the attention when configuring night vision. They matter, but so does the optical system surrounding those tubes.
The objective controls how scene light reaches the intensifier. The eyepiece presents the intensified image to your eye. Together, they influence clarity, contrast, viewing comfort, focus adjustment, and the weight of the completed device.
At Quad Defense, we offer three primary optical configurations: MBS ULR, Mil-Spec Noctis/NVD, and RPO Ultralight. Each has a place in our lineup.
01 // UNDERSTAND THE SYSTEM
OBJECTIVE + EYEPIECE
OBJECTIVE LENS
Collects scene light and focuses it onto the image intensifierβs input. Turning the objective adjusts focus for the distance to the scene.
EYEPIECE ASSEMBLY
Presents the intensified image to your eye. The diopter adjustment focuses the tubeβs output for your eyesight, independently of scene distance.
ONE COMPLETE SET
One optical set means one objective and one complete eyepiece assembly. A binocular uses two sets, so optical weight savings are doubled.
02 // THE LINEUP
THREE OPTICAL PACKAGES
MBS ULR
Our primary recommendation for many compatible builds. MBS combines reduced weight, a clear viewing experience, and reinforced mechanical interfaces in a package we enjoy building with and using.
- Approximately 98 g per optical set
- Reinforced aluminum objective interface
- Ruggedized diopter
- Our preferred overall balance
MIL-SPEC
NOCTIS / NVD
The traditional Carson-pattern optical package. An established choice for customers who value conventional mil-spec components, familiar handling, and a broad service ecosystem.
- Traditional PVS-14 optical architecture
- Established industry reference
- Broad platform and parts support
- Heavier than our lightweight alternatives
RPO ULTRALIGHT
A strong option for reducing completed-device weight. Our offering pairs an RPO ultralight objective with an RPO 4.0 eyepiece and LLI adjustable diopter.
- Substantial optical weight reduction
- Compact optical package
- Excellent option for lightweight builds
- Weight varies with diopter configuration
03 // MBS ULR
WHY MBS IS OUR HOUSE GLASS
ULR stands for Ultra Light Rugged. The appeal goes beyond the number on the scale. We like the clarity, the physical design, the controls, and the attention paid to the interfaces used during focusing and diopter adjustment.
At approximately 98 g per objective and eyepiece set, MBS removes weight compared with the traditional Noctis reference package while retaining the familiar PVS-14-pattern format.
LIGHTER COMPLETE BUILDS
Compared with the referenced 126 g Noctis set, MBS saves approximately 28 g per channel. On binoculars, that becomes approximately 56 g, or nearly 2 oz.
REINFORCED INTERFACES
An aluminum objective sleeve and Lightweight Rugged Diopter provide reinforced interfaces at key adjustment points.
CLARITY + HANDLING
We like the combination of image clarity, reduced weight, and everyday operation. That complete experience makes MBS our preferred starting point for many builds.
OPTICAL EFFICIENCY //
MORE LIGHT THROUGH THE GLASS
One of MBS ULRβs benefits is its ability to transmit light. Its optical coatings help more available scene light pass through the objective and reach the image intensifier, supporting a brighter image.
That efficiency can be especially useful with lower-gain tubes, helping you get more from the available light and the performance of the tubes you already have. It does not increase the tubeβs specified gain or make different tube classes equivalent.
MBS PUBLISHED SPECIFICATIONS
| Specification | Objective | Eyepiece |
|---|---|---|
| Field of view | 40Β° | 40Β° |
| Specified resolution | 72 lp/mm | 72 lp/mm |
| Effective focal length | 25.1 mm Β± 0.5 mm | 25.1 mm Β± 0.5 mm |
| F-number | F/1.23 | Not applicable |
| Eye relief | Not applicable | 29 mm |
| Specified spectral range | 530β910 nm | Visible light |
| Listed system distortion | 5% | 5% |
These are published optical specifications. A lens resolution rating describes the optics; it does not replace the resolution or FOM shown on your image intensifierβs data sheet.
04 // MIL-SPEC NOCTIS / NVD
THE STANDARD FOR A REASON
Carson-pattern Noctis/NVD optics remain the mil-spec and industry-standard option in our lineup. They provide the conventional reference point for evaluating alternative PVS-14-pattern optical packages.
There is still a strong case for choosing them: familiar operation, established parts availability, broad platform support, and a conventional optical configuration that builders and users know well.
The primary tradeoff in this comparison is weight. Customers prioritizing a traditional mil-spec configuration may be comfortable carrying that additional weight. Customers focused on reducing helmet load may prefer MBS or RPO.
05 // RPO ULTRALIGHT
WHEN WEIGHT IS THE PRIORITY
Rochester Precision Optics provides an excellent lightweight offering. For customers trying to reduce the weight of a completed monocular or binocular, RPO deserves serious consideration.
A reference RPO configuration uses a 35 g objective and 41 g eyepiece, totaling approximately 76 g per optical channel. That is approximately 152 g for the optics on a binocular.
The matching conventional Carson reference weighs approximately 53 g for the objective and 59 g for the eyepiece. On that comparison, RPO saves approximately 36 g per channel or 72 g across binoculars.
35 G REFERENCE
Compared with a 53 g Carson reference objective, this removes approximately 18 g from the front optical assembly per channel.
41 G REFERENCE
Compared with a 59 g Carson reference eyepiece, this removes approximately 18 g from the rear optical assembly per channel.
72 G SAVED
Approximately 2.54 oz removed across two channels in this reference comparison, without replacing the housing or image intensifiers.
06 // THE NUMBERS
OPTICAL WEIGHT COMPARISON
The table below keeps the reference configurations separate. These are optical weights only. They do not include the housing, intensifier tubes, battery, mount, or accessories.
| Configuration | One channel | Binocular optics | Comparison basis |
|---|---|---|---|
| Noctis reference | 126 g / 4.44 oz | 252 g / 8.89 oz | Reference used in the MBS comparison |
| MBS ULR | 98 g / 3.46 oz | 196 g / 6.91 oz | Saves approximately 56 g / 1.98 oz on binoculars versus the 126 g Noctis reference |
| Carson reference | 112 g / 3.95 oz | 224 g / 7.90 oz | 53 g objective + 59 g eyepiece; reference used in the RPO comparison |
| RPO reference | 76 g / 2.68 oz | 152 g / 5.36 oz | 35 g objective + 41 g eyepiece; saves approximately 72 g / 2.54 oz on binoculars versus the 112 g Carson reference |
Optical weight reduction is especially useful on binoculars because every component is duplicated. It can reduce the load carried forward of the helmet mount, although overall comfort still depends on helmet fit, mount position, and balance.
07 // OPTICAL PERFORMANCE
LOOK BEYOND THE WEIGHT
CLARITY + CONTRAST
Consider fine detail and how clearly nearby tones separate. Evaluate the usable image across the field, including the edges, rather than judging only the center.
TRANSMISSION
Efficient objective transmission helps more scene light reach the intensifier. The result depends on wavelength, coatings, lens design, and the tubeβs response.
FLARE CONTROL
Light sources in or near the field can reveal reflections and veiling glare. Compare in the same conditions and distinguish optical flare from the tubeβs halo behavior.
EYE RELIEF + EYEBOX
Eye relief describes viewing distance. Eyebox describes the range of eye positions that preserves a useful image. Both affect how the system feels behind your helmet setup.
DISTORTION
Distortion changes how shapes appear across the image. Similar fields of view do not guarantee the same visual geometry or viewing experience.
FORM + FUNCTION
Focus feel, diopter adjustment, mechanical interfaces, accessory fit, and housing clearance all deserve attention. The best package needs to work well as a complete device.
08 // GLASS + TUBES
BETTER LIGHT DELIVERY
SUPPORTS THE SYSTEM
An objective that transmits more useful light can help the intensifier make better use of the scene. This is why optical efficiency matters, including when configuring systems with lower-gain tubes.
More efficient optics can support a brighter, more usable image under comparable conditions. They do not change the tubeβs underlying gain, signal-to-noise ratio, resolution, or FOM. Tube selection and optical selection should work together.
For a useful comparison, keep the tube, scene, focus, gain, and viewing position as consistent as possible. Through-device photos and video can help illustrate differences, but camera exposure and focus can also hide or exaggerate them.
09 // QDEF RECOMMENDATIONS
WHICH GLASS SHOULD YOU CHOOSE?
MBS ULR
OUR PRIMARY OFFERING
Choose MBS when you want our preferred balance of weight, clarity, optical efficiency, and mechanical design. This is our house glass and our starting recommendation for many compatible custom builds.
NOCTIS / NVD
THE MIL-SPEC STANDARD
Choose Noctis/NVD when you want the conventional industry standard, familiar components, or a specific mil-spec optical configuration. It remains a strong option when minimum weight is not your primary objective.
RPO ULTRALIGHT
WEIGHT-FOCUSED BUILDS
Choose RPO when reducing completed-device weight is a leading priority. We will help confirm the objective, eyepiece, and diopter combination so the weight comparison reflects the system you are actually buying.
10 // NEW BUILDS + UPGRADES
MATCH THE COMPLETE DEVICE
These optical packages serve compatible PVS-14-pattern platforms. We verify the exact housing, lens assemblies, and accessories before recommending a configuration.
If you already own a device, an optical upgrade may help reduce weight or change the viewing experience while retaining your existing housing and tubes.
Installation and setup matter. Depending on the device and work performed, we check optical alignment, focus stops, collimation where applicable, and the seal and purge condition. Send us your current configuration and what you want to improve.
EXPLORE // BUILD YOUR SYSTEM
COMPARE THE OPTIONS
THE RIGHT GLASS
FOR YOUR BUILD
Tell us your budget, intended use, and weight priorities. Weβll help you choose the housing, image intensifiers, and optics as one complete system.
ENTER THE DARK ROOM β