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Featuring high precision, fast cutting, automatic typesetting for material saving, smooth incision, low processing cost, etc., laser cutting machines will gradually replace traditional cutting equipment and be widely applied in various industrial fields as technology develops.

Difference between varifocal andfixed lensCCTV

With a 20-year dedication to laser chiller’s R&D, manufacturing and sales, every S&A chiller complies with CE, RoHS and REACH international standards. Annual sales exceeding 100,000 units, a 2-year warranty and quick after-sales response render our products well-trusted by many laser enterprises.

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Fixed lensvs zoomlens

Fixed focal length lenses are entocentric lenses, meaning that they collect rays diverging from the optical axis. Fixed focal length lenses are commonly used optics in machine vision, being affordable products that are well suited for standard applications.

The convenience of variable focal length comes at the cost of complexity and some compromises on image quality, weight, dimensions, and aperture. Varifocal lenses can suffer from loss of image resolution at their maximum aperture, especially at the extremes of their focal length range. This effect is evident in the corners of the image when displayed in a large format or high resolution. The greater the range of focal length a lens offers, the more exaggerated these compromises must become.

Fixed lensCCTV

Zoom lenses are often described by the ratio of their longest to shortest focal lengths or by the ration between their maximum to minimum magnification. In this category, we can also find macro zoom (e.g. Opto Engineering® MCZR and MZMT) and telecentric zoom lenses (Opto Engineering® TCZRS).

Varifocal lenses are lenses with variable focal length (and thus angle of view), which can be adjusted by moving groups of optical elements with respect to each other inside the lens. The variable focal length allows for multiple combinations of working distances and magnifications, offering several different configurations with a single lens.

For most standard lenses the working distance (WD) is not a fixed parameter. The focusing distance can be changed by adjusting a specific knob. Nevertheless, there is always a minimum object distance (MOD) below which focusing becomes impossible. Adding an extension tube (see Fig. 46) between the lens and the camera increases the back focal length, making it possible to reduce the MOD.

Varifocallensvsfixed lens

What isafixedfocal lengthlens

With a dual temperature control system, S&A chiller can provide reliable cooling for both the laser source and the optics. The industrial water chillers boast high temperature stability of ±0.1℃, which can precisely control the temperature of the laser source and the optics, stabilize the output beam efficiency, protect the machine’s components to avoid high-temperature burnout, extend the service life and improve the working efficiency of the equipment.

What isvarifocallensin CCTV cameras

This also increases the magnification of the lens or, in other words, reduces the FOV. While very common in the vision industry, this procedure should be avoided as much as possible, because it degrades the lens performance (resolution, distortion, aberrations, brightness, etc.). In these cases, it is recommended to use lenses natively designed to work at short working distances (macro lenses).

For the polarization problem, you can correct the beam and follow up on its situation. But if the laser energy is so strong that the protection lens cannot withstand such high temperatures, it's suggested to select an industrial cooler for the heat dissipation of your laser equipment.

TEYU S&A Chiller was founded in 2002 with 22 years of chiller manufacturing experience, and now is recognized as a cooling technology pioneer and reliable partner in laser industry.

During the processing of laser equipment, the energy beam is extremely large and its temperature is relatively high. If the light is polarized or the laser power is too high, it will also lead to the high temperature of the protective lens, causing burnout or a cracked situation.

In most situations, improper maintenance is the reason for burn-out protection lens: dust pollution on the lens and no optical output is timely stopped; the temperature of the lens is high and there exists moisture; auxiliary gas blown out is unclean; nonstandard press; the emission of laser beam path offset; the aperture of the cutting nozzle too large; the use of inferior protective lens; a collision between the lens and other objects... All these will easily result in burn-out or cracked protection lenses.

Zoom lenses, also called parfocal lenses, are a special type of varifocal optics in which the working distance is kept constant when changing focal length (i.e. the focus is maintained throughout the process).

What isvarifocallens

The laser cutting machine protection lens can protect the internal optical circuit and core parts of the laser cutting head. The cause of the burnt-out protective lens of the laser cutting machine is improper maintenance and the solution is to select a suitable industrial cooler for the heat dissipation of your laser equipment.

Fixed focal length lenses are inexpensive and versatile, but they are not suitable for all applications. They usually introduce significant perspective errors and geometric distortion that are incompatible with precision measurement applications. Also, the manually adjustable iris and focus introduce some mechanical play, which makes these lenses not ideal for applications requiring very consistent and repeatable settings.

Laser cutting machine protection lens is also called the laser cutting machine focusing lens, which is a very important precision component in the optical system of the laser cutting machine. It can protect the internal optical circuit and core parts of the laser cutting head, and its cleanliness directly affects the machine’s processing performance and quality.

Knowing the basic parameters - focal length and sensor size - it is easy to calculate the field of view and working distance; the focus can be adjusted from a minimum working distance to infinity; usually also the iris is controlled mechanically, allowing you to manually adjust the lens F/# and consequently the light intensity, field depth and resolution.