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Frequently Asked Questions
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We're always happy to answer any question you have about our quality Sightmark products, but often times we receive the same or similar questions from multiple customers. In those situations, we usually post the answer here as an FAQ for everyone to read. While we're always happy to take your call or e-mail in regards to a question about your Sightmark product, we ask that you look through these FAQs first.
Night Vision (6)
Night vision devices work by amplifying light in the near visible light range (approximately 750-850 nanometers.) Heat is situated much lower on the light spectrum and is therefore not visible to a night vision device. Sightmark is working on thermal imaging devices.
It varies anywhere from 10-1000 yards, depending on the tube quality, product construction, and viewing environment. Overcast conditions, including fog and rain, may reduce the effective distance of a night vision device. An infrared (IR) illuminator will increase viewing range and image quality, especially in enclosed areas like warehouses, caves, or thick brush.
Night vision has gained popularity in the past ten years, and is used for both professional and recreational purposes. Law enforcement, search & rescue missions, border control, surveillance, and property maintenance have all benefited from night vision optics.
A night vision scope is made up of a set of optics (glass), a system of electronics (batteries, wire, transformer, regulators and capacitors), and an image intensifier tube.
When handled with care, Sightmark night vision devices will provide many years of quality night-vision viewing, however, it is important to note that night vision devices house delicate intensifier tubes.
Sightmark Night Vision products collect and amplify existing light through the objective lens, which is then focused on the image intensifier. Inside the intensifier, a photocathode is "excited" by the light and converts the photon energy into electrons. These electrons accelerate across an electrostatic field inside the intensifier and strike a phosphor screen, which is similar to a green monochrome TV screen. The phosphor screen then emits an image that you can see. It is the acceleration of electrons, which provides gain and enhances the image.
Minutes of elevation varies in Sighmark riflescopes but are generally around 60 MOA.
Yes, Sightmark riflescopes are tested to withstand up to .50 BMG.