We will look at some of the most important aspects that one needs to acquire when planning to install their right and effective CCTV system. There are some factors that closely relate to the camera lens that may sometimes go unnoticed. CCTV camera lenses greatly determine the kind of images that would be produced since better lenses are likely to produce better and quality images and this is important when it comes to security and surveillance. It is for this reason that in this article, we are going to take a closer look at CCTV camera lenses with an emphasis on varifocal lenses with their advantages, characteristics and usage.
What is Meant by CCTV Camera Lens?
CCTV Camera Lens is a vital part of CCTV system that assists in gathering light in to the image sensor of the camera. The lens plays a very important role in dictating the field of view of the camera, the depth of field and the general quality of the picture produced. CCTV camera lens should be able to produce and provide a clear image Livid and with limited distortion or aberration.
There are several categories of CCTV camera lenses which are explained below:
There are several types of CCTV camera lenses available, each with its unique characteristics and applications:
Fixed Lenses: These lenses do not adjust from one distance to another and are good for the camera to be focused on one area such as a door way, or a cash register.
Varifocal Lenses: These lenses come with the capability of changing the amount of magnification, making it possible for the users to move from a small area of focus to a large one. Varifocal lenses are most suitable in situations where the camera’s area of view has to be wider, for instance, a parking lot, a large room, and so on.
Zoom Lenses: These lenses come with convenience of zoom so that users can cover a wide range of focal lengths in relation to the scene. PTZ cameras employ the use of zoom lenses hence the abbreviation which stands for Pan-Tilt-Zoom.
Wide-Angle Lenses: These are lenses that have a shorter focal, and are therefore used in capturing a wider field of vision. This lenses are normally used in conditions where a large region requires surveillance in industrial buildings, public places, and the like.
Varifocal Lenses: This work is written in order to showcase the benefits and features of the given subject.
Cameras used in CCTV use varifocal lenses due to factors such as versatility of these lenses. Here are some benefits and features of varifocal lenses:
Adjustable Focal Length: Other features include adjustable focal length that makes it possible for the user to zoom in and out of a particular scene. This feature is very much useful in the applications that requires the camera to capture a large scene.
Wide Range of Focal Lengths: Varifocal lenses have expansive focal length that is quite ideal especially when being applied for distinct tasks.
Easy Installation: Varifocal lenses are even easier to integrate than fixed lenses because of the fact that the focal length can be easily adjusted to suit a given application.
Cost-Effective: One advantage of varifocal lenses may be that may be viewed as more economical than separate fixed lenses.
Applications of Varifocal Lenses
Varifocal lenses are suitable for a wide range of applications, including:
Security and Surveillance: Varifocal lenses come handy in security or surveillance; in a parking lot or any large open area for instance.
Retail and Commercial: Varifocal lenses are used in retail and commercial purposes which include surveillance of a store or a warehouse.
Industrial and Manufacturing: Varifocal lenses are applied in safety glasses in industries and factories to oversee a conveyor belt, a factory among others.
CCTV camera lens and how to select a suitable one:
When choosing a CCTV camera lens, there are several factors to consider:
Focal Length: The lens of the camera is defined by the focal length, which also refers to the field of view of the device. Low focal length offers the ‘seeing’ of a large area or a wide-angle view while high focal length offers a narrow area or the tele-view.
Aperture: Relative to this, the aperture discussed in the case is the opening in the lens through which light is admitted into the camera. A large aperture is used when more light needs to be allowed into the system while a small aperture will allow less light to enter into the system.
Resolution: The last is the resolution of the lens and it dictates the kind of detail that is returned by the camera. A high resolution lens gives a sharper image and is more detailed as compared to a lens of low resolution.
Distortion: The degree of distortion in the image depends upon the degree of distortion incorporated in the lens. Thin lens gives least amount of distortion and therefore produces least distorted image.
Due to this, the lenses used by CCTV cameras are of significant importance since they help capture good images. Especially, CCTV Camera Varifocal Lens has a number of advantages and options that can make these lenses proper for usage in different situations. In selecting a lens for a CCTV camera, the following factors are important; the focal length, the aperture, the resolution and the distortion. Thus, choosing the most appropriate lens for your CCTV system means you’ll be able to meet your security and surveillance requirements. Conventional lens together with latest technologies provide a wide range of CCTV camera lens to provide security to a small area like shop or office to a large complex area like a stadium. It is time that you took a step up to a better CCTV system and see how much better surveillance can be.
