Mil-Spec vs. Ultralight Optics Traditional Mil-Spec glass prioritizes proven optical performance, durability, and broad compatibility. For users looking to reduce the overall weight of their night vision system, QDEF also offers lightweight optical packages from MBS and Rochester Precision Optics (RPO). Because a binocular night vision system uses two objective lenses and two eyepiece assemblies, reducing the weight of the optics can make a meaningful difference in the overall weight and balance of the completed system. MBS ULR Optics MBS ULR optics are a lightweight alternative to traditional Mil-Spec PVS-14 glass. They are designed for users who want to reduce optical weight while maintaining the familiar PVS-14-pattern optical architecture. For lightweight monocular and binocular builds, MBS ULR provides another option for reducing the weight of the complete night vision system without changing the housing or image intensifiers. RPO Ultralight Optics Rochester Precision Optics (RPO) takes a similar weight-focused approach with its ultralight objective and RPO 4.0 eyepiece assemblies. RPO optics are designed for users building premium lightweight night vision systems where reducing the weight of the objective and eyepiece assemblies is a priority. Which Optics Should You Choose? Mil-Spec Noctis/NVD is the traditional choice for proven optical performance, durability, and broad compatibility. MBS ULR and RPO 4.0 provide lightweight alternatives for builds where reducing overall system weight is a priority. There isn't a single optical package that's right for every system. Housing, image intensifiers, intended use, weight target, and budget should all be considered when selecting the optics for a night vision build. Need Help Choosing Night Vision Optics? Quad Defense offers MBS ULR, Mil-Spec Noctis/NVD, and RPO 4.0 optical configurations across our compatible custom night vision systems. If you're unsure which option makes the most sense for your build, our team can help compare the available configurations. Contact QDEF →