FREQUENTLY ASKED QUESTIONS

FOM is a number calculated by multiplying the Signal-to-noise ratio by the resolution of a night vision image intensifier. FOM number allows quickly estimating the general performance level of the specific night vision image intensifier and, consequently, the night vision device built around it.

Product "lead time" and "shipping time" are two distinct concepts that are often used in logistics, supply chain management, and e-commerce. Here's how they differ: Product Lead Time: Definition: The time it takes from when an order is placed until the product is ready to be shipped. It includes the time needed for manufacturing, sourcing, assembling, or preparing the product. Includes activities such as order processing, production (if it's a made-to-order item), quality checks, and packaging. Example: If a company needs to manufacture a custom product, the lead time may be 7 days (including materials sourcing, production, and packaging). Shipping Time: Definition: The time it takes from when the product is shipped (after the lead time) to when it arrives at the customer’s location. It is the actual transit time of the product. Includes: Only the time during which the product is physically in transit via the shipping service (courier, postal service, freight). Example: If the product is shipped via a standard courier, the shipping time might be 3-5 days depending on the location. Summary: Lead Time = Time to prepare the product (before shipping starts). Shipping Time = Time in transit (once the product is shipped). Both lead time and shipping time together form the total time a customer waits to receive a product

This is an IR Light Emitting Diode (LED). When turned on, the IR Source provides additional illumination to enhance existing light conditions and aid the performance of the night vision device. Ideal for map reading and is for short-range use.

After receiving your order, it will take approximately 1-2 business days for processing. At that time your credit card will be charged.

A measurement of image intensifier resolution. The more line pairs per millimeter, the better the resolution.

In Generation II and III systems, the objective lens collects minute particles of light (called photons) that you cannot see with your naked eye and focuses then on the image intensifier. Inside the image intensifier tube, a photocathode absorbs this light energy and converts it into electrons. These electrons are then drawn through the micro channel plate that multiplies them thousands of times. When this highly intensified electron image strikes the phosphor screen, it causes the screen to emit light that you see. Since the phosphor screen emits this light in exactly the same pattern and degrees of intensity as the light that is collected by the objective lens, the bright night time image you see in the eyepiece corresponds precisely to the outside scene you are viewing. Performance is the most important factor in night vision capabilities. Will a particular device allow you to see objects in near complete darkness? Night vision equipment offered by our partners will provide high quality images under extremely low light conditions such as cloudy, no moon nights. There are several terms used to compare the qualities of one tube to another. These specifications, such as Resolution, Signal-to-noise, and Photocathode Response will determine how well a system will perform in these adverse conditions.

These are cosmetic blemishes in the image intensifier or can be dirt or debris between the lenses. Black spots that are in the image intensifier are common, and do not affect the operation or reliability of a night vision device.

We do not ship internationally. Export of the commodities described herein is strictly prohibited without a valid export license issued by the U.S. Department of State Office of Defense Trade Controls prescribed in the International Traffic in Arms Regulation (ITAR),Title 22, Code of Federal Regulations, Parts 120-130. All orders must be accompanied with our End User Statement

This question is more for UPS/USPS, but we'll try to help you here with some instructions. Step 1: Check the USPS/UPS tracking link. Most common solutions: Tracking details show that the package is in transit or not picked up? Wait several days for USPS/UPS to provide an update. They sometimes miss scans, and packages will appear to teleport across the U.S. Also, check the product's webpage to see if any delays or production times are listed. Mine has delays, what are the options? Click here. The tracking link shows Lost or Damaged? File a packaging claim with them. Click the links: USPS or UPS Once a claim is filed: They will investigate themselves and request paperwork from us or you. Then another item can be shipped if needed. Step 2: The package carrier has not shown movement in over 7 days. Most common solutions: It's likely USPS or UPS have lost the package if you have not seen any movement from them in more than 7+ days. Starting the USPS/UPS lost package claim process: File a claim with them. Click the links: USPS or UPS Once a claim is filed: They will investigate themselves and request paperwork from us or you. Then another item can be shipped if needed. Step 3: USPS/UPS claim has been started. What now? We both have to wait for USPS/UPS to complete their determination of if the package was truly lost OR if they are able to find the package and continue with its delivery. It is not NightVisionNetworks fault that a package was lost in transit. We are here to work with you through the Claims process with USPS or UPS. If you need any help or documents from us, please let us know. USPS/UPS will send either us or you paperwork to fill out. (Usually, 10-15 days after the investigation has determined the package is lost.)

You cannot take Night Vision Equipment out of the United States. It is a Federal Offense to do so without valid U.S. State Department approval. Night Vision Equipment is both tightly controlled by the U.S. Government and heavily enforced, and falls under the International Traffic in Arms Regulation (ITAR), which states, “Export of the commodities described herein is strictly prohibited without an export license granted by the U.S. Department of State Office of Defense Trade Controls prescribed in the International Traffic in Arms Regulation (ITAR), Title 22 Code of Federal Regulation, Parts 120-130. Night Vision Devices, Inc. will not complete any transaction that requires the illegal export of products and will not assist directly or indirectly with any illegal export or re-export of any products. Full ITAR language can be found here: https://www.pmddtc.state.gov/regulations_laws/itar_official.html It is a violation of ITAR to allow any non-U.S. person to use or look through U.S. Gen III Night Vision Equipment, or to have access to any operator’s manual or documentation pertaining to U.S. Gen III Night Vision Equipment.

The width or angle of the outside scene that can be viewed through the intensifier tubes measured horizontally and vertically.

Also called brightness gain or luminance gain, this is the number of times a night vision device amplifies light input. It is usually measured as tube gain and system gain and is usually in values of tens of thousands. U.S. military GEN II and GEN Ill image tubes operate at gains of between 7,000 and 65,000.

The distance your eyes must be from the last element of an eyepiece in order to achieve the optimal image area.

A steady pinpoint of bright light in the image area that does not disappear or move even when all light is blocked from the objective lens. If an emission point disappears or is only faintly visible when viewed under brighter nighttime conditions, it is not indicative of a problem. Emission points are considered an operational defect as opposed to a cosmetic blemish.

An area of brightness around the edge of the image. Edge glow can be caused by an emission point but can also be caused by a defective phosphor screen causing light feedback into the photocathode. To check for edge glow, block all incoming light from the objective lens. Edge glow will still be present. Edge glow is considered an operational defect as opposed to a cosmetic blemish.

If the system has shading, the whole field of view will not be present. a defective vacuum seal on the image intensifier will cause the photocathode to die, which causes shading on part of the image. Shading will have distinct lines where the shading stops. This is an operational defect as opposed to a cosmetic blemish.

An electronic function that reduces the voltage to the photocathode when the night vision device is exposed to bright light sources such as room lights or car lights. BSP protects the image tube from damage and enhances its life; however, it also lowers resolution when functioning.

An electronic feature that automatically reduces voltage to the microchannel plate to keep the image intensifier’s brightness within optimal limits and protects the tube. The effect of this can be seen when rapidly changing from low light to high light conditions; the image becomes brighter and then after a momentary delay, suddenly dims to a constant level.

The amount of light you see in an image tube that is turned on, but has no light at all on the photocathode. The EBI level determines the lowest light level at which you can detect something. Below this light level, objects will be masked by the EBI.

The unit of measure used to define eye correction to the refractive power of a lens. Usually adjustments to an optical eyepiece accommodate for differences in individual eyesight. Most night vision systems provide a +2 to -6 diopter range.