Night Vision specs and what they mean
What are specs and what do they mean?
Figure of Merit (FOM):
The Figure of Merit (FOM) is a quantitative measure used to evaluate the performance of a device or system, often used in comparing the effectiveness of different systems. In night vision technology, for instance, the FOM is calculated by multiplying the resolution (measured in line pairs per millimeter) by the signal-to-noise ratio (SNR). A higher FOM indicates better overall performance.
Photocathode Sensitivity:
Photocathode sensitivity refers to the ability of the photocathode (a component of image intensifier tubes in night vision devices) to convert incoming photons into electrons. This sensitivity is typically measured in microamperes per lumen (µA/lm). Higher sensitivity means the device can detect lower levels of light, making it more effective in low-light conditions.
Equivalent Background Illumination (EBI):
EBI is a measure of the intrinsic noise level of a night vision device when there is no external light input. It represents the amount of light that the device would need to detect to produce an output signal equivalent to its internal noise. Lower EBI values indicate better performance in low-light conditions, as the device can discern weaker signals without being overwhelmed by its own noise.
Halo:
In night vision devices, the halo effect refers to the ring or circular distortion that appears around bright light sources in the field of view. This is caused by the scattering of electrons within the image intensifier tube. Halos can obscure or distort the image, reducing the clarity and quality of the view. Reducing the halo effect is important for improving image quality in high-performance night vision systems.
Luminous Gain:
Luminous gain is the ratio of the output light to the input light in a night vision device. It is usually measured in terms of the increase in brightness (gain factor). Higher luminous gain means that the device can amplify very low levels of light to a much higher level, making it easier to see in dark environments. However, excessive gain can lead to image distortion or noise.
Signal-to-Noise Ratio (SNR):
The signal-to-noise ratio (SNR) is a measure of the level of the desired signal relative to the background noise. In night vision technology, SNR is critical for determining the clarity and quality of the image. A higher SNR means that the signal (the actual visual information) is much stronger than the noise (random fluctuations or interference), resulting in a clearer and more detailed image.
Resolution:
Resolution refers to the ability of an imaging system to distinguish between closely spaced objects. In night vision devices, resolution is typically measured in line pairs per millimeter (lp/mm). Higher resolution means the device can distinguish finer details, providing a clearer and more detailed image. This is important for identifying objects and understanding the scene in low-light conditions.
What is the difference between NNVT,Elbit, and L3 tubes?
- Technology and Performance:
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- NNVT: Known for producing Gen 2 and Gen 3 image intensifier tubes. Their tubes are typically used in various night vision devices and are valued for their reliability and cost-effectiveness, particularly in military applications.
- Elbit Systems: Previously ITT Exelis, Elbit offers advanced Gen 3 image intensifier tubes known for high performance, durability, and low light amplification. They produce white phosphor tubes that provide better contrast and resolution compared to traditional green phosphor.
- L3 Technologies: Another leading manufacturer of Gen 3 tubes, L3 is known for its high-performance image intensifiers, including white phosphor technology. Their tubes are often used in high-end military and law enforcement applications and are known for their clarity, resolution, and light amplification capabilities.
- Applications:
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- NNVT: Used widely in military applications due to their cost-effectiveness and solid performance. They are also used in some commercial and law enforcement applications.
- Elbit Systems: Their tubes are commonly used in military, law enforcement, and high-end civilian applications, especially where high performance and reliability are crucial.
- L3 Technologies: Predominantly used in military and law enforcement scenarios where the highest performance is required. Their tubes are often found in top-tier night vision devices.
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Cost:
- NNVT: Generally offers a more cost-effective solution compared to Elbit and L3, making them a good choice for bulk military purchases and budget-conscious buyers.
- Elbit Systems: More expensive than NNVT but offer superior performance, particularly with their white phosphor tubes.
- L3 Technologies: Typically the most expensive due to their cutting-edge technology and high performance, especially in demanding environments.
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Availability and Market Presence:
- NNVT: Has a strong presence in the Asian market and is expanding globally.
- Elbit Systems: Well-established in the global market with a strong presence in the US and Europe.
- L3 Technologies: Dominates the US market and has a significant global footprint, especially in military applications.
In summary, while all three manufacturers produce high-quality image intensifier tubes, NNVT is known for affordability and reliability, Elbit Systems for advanced performance and white phosphor technology, and L3 Technologies for top-tier performance and clarity, especially in critical military and law enforcement operations.
Can I travel outside of the USA with Night Vision?
No, you cannot take your night vision device outside of the USA without proper authorization. These devices are subject to strict export regulations.
Policies
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Payment Policies
All payments are due upon receipt. If a payment is not received or payment method is declined, the buyer forfeits the ownership of any items purchased. If no payment is received, no items will be shipped.
Shipping Policy
To ensure the security of our customers and to prevent fraudulent transactions, we have implemented a strict policy requiring that the shipping address and billing address for all orders must match exactly. This measure is designed to protect our customers' personal and financial information by verifying that the individual placing the order is the authorized cardholder. We understand that this may cause some inconvenience, but it is a crucial step in safeguarding against identity theft and unauthorized purchases. As such, we will not process or ship any orders where the shipping and billing addresses do not align perfectly. This policy applies to all orders without exception, ensuring a secure transaction process for every customer. If you encounter any issues or have questions regarding this policy, please contact our customer service team for assistance.
Legalities
The seller is not responsible for any health or safety concerns once the buyer has received the item. If any harm is incurred from the items purchased by the buyer, the seller shares no responsibility.
These terms and conditions are subject to change.
Refund Policy
Due to the unique nature of our products and services, we do not have a standard return policy. However, we understand that there may be circumstances where a return is necessary. Therefore, we handle returns on a case-by-case basis.
If you wish to return an item, please contact our customer service team within 10 days of receiving your order. Our team will assess your request and determine if a return is possible. Please note that not all returns will be accepted.
Returns may be accepted under the following conditions:
- The item is damaged or defective upon arrival.
- The wrong item was shipped to you.
- The item is significantly different from what was described on our website.
In order to initiate a return, you must provide proof of purchase and photographic evidence of any damage or defects. Returns without proof of purchase may not be accepted.
Please be aware that return shipping costs may be the responsibility of the customer unless otherwise specified by our customer service team.
By making a purchase from Midwest Night Vision, you agree to abide by this return policy. We reserve the right to refuse any returns that do not meet the criteria outlined above or that are submitted without proper documentation.
If you have any questions or concerns about our return policy, please don't hesitate to contact our customer service team. Thank you for your understanding and cooperation.
Demo Policy
Yes, we offer night vision equipment demos. As a special incentive, if you decide to purchase any night vision equipment following the demo, the $200 retainer fee you initially paid will be credited towards your purchase. This means the nonrefundable fee will be applied as a discount on the total cost of the night vision equipment, effectively reducing your overall expense. This offer is valid for purchases made within 30 days of the demo, giving you ample time to evaluate your options and make an informed decision. We believe this policy not only ensures you receive the best possible value but also demonstrates our commitment to providing exceptional customer service and satisfaction. Our goal is to make your purchasing experience seamless and rewarding, so you can feel confident in your investment in our high-quality night vision technology.
How can I recieve a MIL/LEO Discount?
Yes, we offer Military and Law Enforcement (Mil/LE) discounts as a token of appreciation for those who serve our country and communities. Eligible individuals can enjoy special pricing on our night vision equipment. For more details and to verify eligibility, please contact our customer service team. Email Blake@mwnvg.com or call us @(913)594-2172
Night Vision warranty
All Night Vision purchased thru Midwest Night Vision carries a 5 year transferrable warranty with proof of order. Please allow 4-6 weeks for repairs depending on damages and demand for night vision.