Night Vision IRIS - With Saphire Glass
 
The MilsimSupply-IRIS (MSI) Aperture Defender is a must-have for any night vision enthusiast. With the largest adjustable iris diaphragm on the market, this device can be used with most night vision devices. It allows users to see objects at all distances with perfect clarity and focus, without needing to refocus the objective lens of their NVG. Additionally, this defender delivers durable, multi-hit, rugged impact protection that keeps your device safe from harm, for example, airsoft bb's. Get your hands on the MSI today and take your night vision experience to the next level.
 
Traditionally, most night vision devices have a large objective lens and aperture size to allow the maximum amount of light into the intensifier. An unwanted byproduct of large aperture size is a shallow depth of field - if the user sets their objective lens focus for infinity, then objects within 20 feet are typically out of focus and blurry. Users typically have to delicately refocus their objective lenses for simple admin tasks (reading maps, adjusting kit, etc) which can be cumbersome, especially on devices with articulating pods. 
 
The iris diaphragm solves the focus issue on NVGs by giving the user the ability to dial in the optimal amount of light into the NVG to maintain full-focus at all distances. By reducing the amount of light, the depth of field increases and everything comes into focus. Because the MSI is larger than the NVG's objective lens, at wide-open aperture, there is no signal degradation.By restricting the amount of light entering the NVG, the adjustable diaphragm also acts as a pseudo gain control for auto-gain NVGs, reducing contrast and giving operators the ability to pick out minute details in high light scenarios and reduce blooming from bright light sources.
 
The smooth-running adjustment wheel along the entire circumference allows users the freedom to manipulate the adjustment wheel at any angle, making adjustments a breeze. When the diaphragm is fully-closed, the diaphragm size approximates the size of a pin-hole, which means you can leave the assembly attached to your night vision device.
 
Built and tested in house to the highest standards.
 
*Sold as singles, if you have a binocular device, buy two*
 
Adjustable Aperture 1.5-26mm Iris Diaphragm.
 
Specifications:
Thread: For PVS-14 lenses only!
Material: Aluminum alloy
Minimum aperture: 1.5mm
Maximum aperture: 26mm
Color: Black
 
All our IRIS come with saphire glass lense protectors. These will help protect your front lense. Milsim Supplies Ltd cannot be held responsible for any damage caused to a device, and each person must carry out their own due diligence to ensure they're happy it will protect their device. 
If glass is damaged in anyway, and/or has been hit by an object, we recommend you replace the glass straight away. 
 
Automatic discount applied for 2 or more units.