For your support! See how to pick the right lens for the camera

The lens is equivalent to the lens of the human eye. If there is no lens, no object can be seen by the human eye; if there is no lens, the image output by the camera is a white one, and there is no clear image output. When the muscles of the human eye cannot stretch the lens to its normal position, which is often referred to as nearsightedness, the scene in front of the eye becomes blurred; the cooperation of the camera and the lens also has a similar phenomenon when the image becomes unclear. , You can adjust the camera's back focus, change the distance between the CCD chip and the lens reference plane, you can clear the fuzzy image. How can you pick the right camera for your camera? The following China Machine Vision Mall offers you a few tips:

1. Select the focal length of the Fixed Focal Lens based on the distance from the camera to the monitored target. Distinguish from the focal length is a short focal length wide-angle lens, a medium focal length standard lens, and a long focal length far lens. The focal length of the lens is usually expressed in terms of value. The lens aperture is generally represented by F, and the value of F is measured by the ratio of the focal length of the lens and the aperture d of the clear aperture, F=f/d, each lens is marked with its large F value.

2. The camera lens size should correspond to the camera CCD target surface size (1/2h for 6.4hX4.8Ï…, 1/3 for 4.8hX3.6Ï…, 1/4" for 3.2hX2.4Ï…) if the lens size When the size of the CCD target surface of the camera is not the same, the observation angle will not meet the design requirements, or the problem that the screen is out of focus may occur.

3, the camera's horizontal vision and vertical vision and the camera CCD target size hX Ï… and lens focal length f have the following relationship: horizontal visual power = 2arctan (h/2f); vertical visual power = 2arctan (Ï… / 2f).

4, the lens has automatic iris (auto iris) and manual iris (manual iris) points. The automatic aperture is used when there is a lot of change in the light of the object being illuminated, and the manual aperture is used to stabilize the light of the object. There are two kinds of auto iris lens drive: a video input type with video driver (with Amp), it sends a video signal and power from the camera to the lens to control the aperture on the lens, this type of video input lens contains The amplifier circuit is used to convert the video signal from the camera into the control of the iris motor. The other is called the DC driverno Amp. It uses the DC voltage on the camera to directly control the aperture. Contain only galvanometer iris motor, there is no amplifier circuit in the camera.

5, the lens is mounted with two types of C-type and CS-type, C-type lens installed in the CCD camera and the lens more than 5mm adjust the aperture value of the ring. Type C cameras can be used with Type C cameras, but cameras equipped with CS cannot use Type C lenses.

6. The zoom lens can make the focal length of the lens change within a certain range within a lens, so the monitored object can be enlarged or reduced. Typical optical zoom specifications are available in different grades, such as 6 to 20 times, and are commonly used in Zoom Lens applications.

7, zoom / zoom lens (Vari Focal Lens) zoom lens with zoom lens function, focal length continuously variable, can zoom in on distant objects, but also provide a wide vision, so that the monitoring width increases. China Machine Vision Mall supplies a number of well-known industrial lenses worldwide, such as computar, AFT, etc. For more information and machine vision product details, please visit the China Machine Vision Shopping Mall hotline.