In addition to fine adjustment screws, there are also ultra-fine adjustment screws. As you may have guessed, ultra-fine adjustment screws have even more threads per inch than their fine adjustment counterparts.

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If an application requires the use of a screw in a specific area of the object or objects, a fine adjustment screw may be used. Optical mirrors, for example, are often mounted using fine adjustment screws. The screw can be driven deeper into the optical mirror, or it can be driven farther out of the optical mirror, to achieve the correct position. Other types of screws offer less-precise adjustments, making them a poor choice for applications such as this.

The most commonly used infrared wavelength for security camera lighting is 850nm IR, it provides best performance versus invisibility balance. Although 850nm IR is invisible to the human eye as “light”, it does produce a slight red glow at the LED light source. For this reason, it is not suitable for covert surveillance applications, such as those for Government or Law enforcement. For covert surveillance, 940nm IR light is recommended, because it is completely invisible to humans, even at the light source.

850nm vs 940nm

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Fine adjustment screws work like most other screws, with consumers and businesses using them to secure objects. However, fine adjustment screws are characterized by the presence of more threads per inch.

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A fine adjustment screw is a type of screw that’s designed with 40 to 100 threads per inch. Of course, this is significantly more threads than traditional screws. As a result, fine adjustment screws can be “adjusted” for increased precision.

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Fine adjustment screws have 40 to 100 threads per inch. In comparison, ultra-fine adjustment screws have 100 to 500 threads per inch. Therefore, ultra-fine adjustment screws can contain over five times as many threads per inch than conventional fine adjustment screws. According to Wikipedia, ultra-fine adjustment screws are incredibly difficult to produce, especially if they contain more than 250 threads per inch.

Fine adjustment screws are typically made of stainless steel. Stainless steel has become the preferred material for adjustment screws because of its ability to withstand rust and degradation. With a chromium content of about 10.5%, it’s naturally protected against rust and corrosion. The chromium is placed on the exterior of steel, resulting in a barrier that inhibits oxidation. Fine adjustment screws made of stainless steel typically last longer and offer a higher level of security and support than those made of other materials.

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For applications when total invisibility is required or for small spaces, an 940nm IR illuminator is a good option. Before choosing a 940nm IR illuminator, please check your cameras specs, to make sure it is sensitive to the 940nm IR wavelength.

Is 850nm IR visible

AXTON’s Tactical series 940nm IR Illuminators are completely covert, invisible to the human eye even at the light source. Tactical Illuminators are available in several models, including: PoE powered, Solar/Battery powered, Compact NANO and Indoor IR Fixtures, more: Tactical IR Illuminators.

Characterized by the presence of external threading, screws are one of the world’s most versatile and commonly used fasteners. They are designed to secure objects by removing materials while simultaneously creating helical grooves. Fine adjustment screws serve this same purpose, but they feature a unique design that distinguishes them from other types of screws. So, what is a fine adjustment screw exactly?

Even high powered 940nm IR illuminators produce no source red glow. However, 940nm IR may have up to 50% less range than 850nm IR  does. Also, security cameras are not as sensitive 940nm as they are to 850nm IR. This is why 850nm IR is used for most long-range security applications, with a longer range, any slight red glow at the lights source will most likely not be noticed. When considering the advantages in expanded coverage range and camera sensitivity, 850nm is usually the best choice for medium to large Security applications.

The human eye can see the light wavelengths in the range of about 380nm to 700nm. Light above 700nm in the infrared spectrum (IR Light) is not visible to the human eye. The shorter “near-infrared” wavelengths, which are closer to visible light, from about 700nm to 900nm, can appear as a faint red glow when looking directly at a high powered IR LED source. However, it is invisible to human eye as “light” that illuminates other objects.

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Most security cameras have sensors which are sensitive to the IR wavelengths that are invisible to the human eye. This is why IR light (IR illuminators) are used to enhance security camera performance in low-light and at nightime. Since infrared is invisible it can be used without causing light pollution and/or covertly. Images a security camera captures using infrared light will be black & white, only full spectrum “white” light can produce color images. If both invisible IR surveillance and colored image capture are needed, AXTON Hybrid lights are a good option.

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