11) What is a zoom lens?

Answer: The focal length of the lens is continuously variable. The focal length can be changed from wide-angle to telephoto. The longer the focal length, the greater the imaging.

12) What is optical zoom?

Answer: The zoom is based on the structure of the optical lens, which is to zoom in and zoom out the scene that needs to be photographed through the movement of the lens.

13) What is a triple variable lens?

Answer: Aperture, focus and focal length need to be adjusted manually

14) What is a two variable lens?

Answer: Usually it is an automatic iris lens, and the focus and focal length need to be adjusted manually

15) What is the video driver of the lens? (Video driver)

Answer: It transmits a video signal and power from the camera to the lens to control the aperture on the lens. This video input lens contains an amplifier circuit to convert the video signal from the camera into the control of the aperture motor

16) What is the DC driverno Amp of the lens

Answer: It uses the DC voltage on the camera to directly control the iris. This lens contains only the galvanometer iris motor, and there is no amplifier circuit in the camera. The two driving methods are not interchangeable, but universal automatic iris lenses are now available

17) What is the difference between C-type interface and CS-type interface?

Answer: There are two types of lens installation: C type and CS type. The C type lens has a 5mm ring between the CCD camera and the lens to adjust the aperture value. Type C mounted cameras can use CS type lenses, but CS mounted cameras cannot use type C lenses

18) What is an aspheric lens? (Aspherical Lens)

Answer: The shape of lens grinding is parabola, quadratic curve, cubic curve or high-degree curve, and the phase difference, chromatic aberration, spherical aberration and other correction factors of the lens are considered in the design. Usually an aspheric lens can reach multiple spherical surfaces The lens corrects the effect of aberrations, so the number of lenses can be reduced, resulting in better precision, better clarity, more accurate color reproduction, reduced light reflection in the lens, and a corresponding reduction in lens volume. Aspheric lens has the characteristics of high magnification, short object distance and large aperture. The high magnification can simplify the types of lenses, the short object distance can be used in close-up camera applications, and the large aperture can adapt to the dark places, so the application field is becoming wider. AVENIA Japan's aspheric lens product SSV0770, the close-up distance can reach 30cm,

19) What is the relative aperture of the lens

Answer: In order to control the amount of luminous flux that passes through the lens, an aperture is set at the rear of the lens. Assuming that the effective aperture of the aperture is d, due to the refraction of light, the actual effective aperture of the lens is D, which is larger than d. The ratio of D to the focal length f is defined as the relative aperture A, that is, A = D / f. The illuminance of the image is proportional to the square of the relative aperture of the lens. It is customary to use F = f / D, that is, the reciprocal of the relative optical path to indicate the size of the lens aperture. The smaller the F value and the larger the aperture, the greater the luminous flux reaching the CCD chip. So with the same focal length f, the smaller the F value, the better the lens.

20) What is CMOS technology?

Answer: The full name of CMOS is Complementary Metal-Oxide Semiconductor, Chinese translation is complementary metal oxide semiconductor. The manufacturing technology of CMOS is no different from that of general computer chips. It is mainly a semiconductor made of silicon and germanium, which coexist on the CMOS with N (charged) and P (charged + charged) In semiconductors, the current generated by these two complementary effects can be recorded and interpreted as an image by the processing chip.