CHANCCTV-OPTICSLENS

1. What is a short   focus  lens? As the name implies, a short   focus lens is a lens with a focal length shorter than a standard lens, and is sometimes also called a wide   angle lens. Generally speaking, a lens with a focal length of less than 50mm (inclusive) in a full-frame camera, or a lens with a focal length of less than 35mm in an APS-C format camera, can be called a short   focus lens. 2. What is a short   focus lens suitable for? Landscape p hotography Short   focus lenses have a wide angle of view and can capture relatively wide landscapes, making them very suitable for landscape photography. Short focus  lens for landscape photography Humanities documentary In a compact space, short   focus lenses can accommodate more scenes and also perform well in humanities documentary and street photography. Architectural p hotography A short   focus lens can capture larger scenes, so it is also very suitable for photographing large buil...

As one of the important equipment for social security guarantee, security surveillance cameras can be seen almost everywhere in our lives, especially in some large public places such as schools, shopping malls, playgrounds, etc., and it is indispensable for its existence. The main function of security monitoring cameras is monitoring, and sometimes it is also a provider of important clues. How to choose the lens of security monitoring camera A good security monitoring camera requires not only choosing a good installation location, but also a good lens. After all, the lens that chooses a security monitoring camera is one of the important factors that ensure the effective operation of the monitoring system and obtain a clear image. So, how to correctly choose the lens of the security monitoring camera ? The focus is still the key indicator of the lens to choose: 1. Choose the right lens type First, you need to choose the appropriate lens type according to the needs of the monitoring scen...

1 、 How to confirm the resolution of industrial lenses? To confirm the resolution of an industrial lens , some measurements and tests are usually required. Let’s take a look at several common methods to confirm the resolution of industrial lenses: MTF Measurement The resolution capability of a lens can be evaluated by testing the Modulation Transfer Function (MTF) of the lens. MTF measurement can reveal the lens's ability to transmit details at different frequencies and contrasts, thereby judging the lens's resolution performance. Resolution test image Use a resolution test image with high contrast and detail to evaluate the resolution capability of the lens. By observing the details and edge conditions in the image, you can initially judge the resolution performance of the lens. Use images to test resolution Use resolution test charts In practical applications, lens resolution can be tested using resolution test charts designed specifically for testing lens resolution. These c...

When it comes to varifocal  lenses , we can know from its name that this is a lens that can change the focal length, which is a lens that changes the shooting composition by changing the focal length without moving the device. On the contrary, a fixed focus  lens is a lens that cannot change the focal length, and if you need to change the shooting composition, you need to manually move the position of the camera. 1 、 The characteristics of the varifocal  lens and fixed focus  lens We can see the characteristics of varifocal  lens and fixed focus  lens from the name, and take a look at the specific: (1)  The characteristics of the varifocal  lens A. Focal length can be changed, one lens provides a variety of focal lengths, can adapt to different shooting needs; B. Overall structure is complex, including multiple lens groups, lens is usually large, relatively bulky; C. Aperture size is usually small, which reduces the ability to shoot in low-light e...

Mid-wave infrared lens is an optical lens that applies mid-wave infrared technology. The working wavelength range is 3-5 microns. It is widely used in the field of industrial inspection, mainly used for thermal imaging and temperature measurement. Application of medium-wave infrared lens in industrial inspection field Application 1: Anomaly detection Many industrial equipment will generate excessive heat if they fail during use. The use of mid-wave infrared lenses can regularly perform thermal imaging scans on equipment in the factory to detect possible equipment failures early, and repair or replace them in time to avoid greater losses. Application 2: Non-contact temperature measurement In industrial production, some equipment or parts are not suitable for direct contact temperature measurement due to high-speed operation or working environment limitations. In this case, the temperature can be indirectly measured through thermal imaging captured by a medium-wave infrared lens to ensu...

1 、 Can line scan lenses be used as camera lenses? Line scan lenses are usually not suitable for direct use as camera lenses. For general photography and video needs, you still need to choose a dedicated camera lens. Camera lenses usually need to have a wide range of optical performance and adaptability to suit the needs of capturing various types of images in different scenarios. The design and function of line scan lenses are mainly used in professional fields such as industrial inspection, machine vision and image processing, and are not used for general photography or videography applications. Next, let’s look at the main differences between camera lenses and line scan lenses: Focal Length and Depth of Field Camera lenses usually have a shorter focal length and a larger depth of field, which are suitable for capturing images in various scenarios, including objects, people, landscapes, etc.; line scan lenses are usually designed with a specific focal length and working distance for...

The iris recognition lens is an important part of the iris recognition system and is usually equipped on a dedicated iris recognition device. In the iris recognition system, the main task of the iris recognition lens is to capture and magnify the image of the human eye, especially the iris area. The recognized iris image is transmitted to the iris device, and the device system recognizes the identity of the individual through the characteristics of the iris. 1 、 How to use the iris recognition lens? The use of the iris recognition lens is bound to the iris recognition device system. For usage, please refer to the following steps: User positioning First, the user being tested needs to stand in front of the iris recognition device and make sure his eyes are facing the lens. Capturing iris images The iris recognition lens built into the system device will automatically capture the user's eye image. During this process, infrared light or other types of light sources may be used to hel...

High   power microscope lenses are an indispensable key component of microscopes. They are an important guarantee for accurate focusing of microscope light and clear imaging. High-power microscope lenses usually have a higher magnification and can clearly observe the details and structures of microscopic objects. Today, let's take a closer look at some of the key features of high-power microscope lenses. Key f eatures of h igh   p ower m icroscope l enses High-power microscope lenses have many significant features that can meet the research needs of different fields. Let's take a look at the main features of high   power microscope lenses: High magnification One of the main features of high-power microscope lenses is their extremely high magnification. They typically have magnifications ranging from 10x to 1000x, allowing users to observe the microscopic structure of tiny objects and gain a deeper understanding of the characteristics and properties of the sample. High ...