What does the camera s high light sensitivity mean

Sensitivity, the speed at which a film reacts chemically to light, is also the standard for the speed of light sensitivity in the manufacturing film industry. In digital cameras, the CCD COMS sensor reacts to light.

At present, the minimum sensitivity of digital cameras is ISO60, and most of them have a minimum sensitivity of 100, and the lower the sensitivity, the more delicate and detailed the picture. In general, within 200 is called low sensitivity. The range of 400 125600 is called high sensitivity.

High sensitivity is generally used in low-light conditions. The higher the sensitivity, the more obvious the noise in the picture, just like **There is a layer of "pockmark" on it, that is, noise. The high sensitivity is used to increase the shutter speed and prevent shaky and blurred images.

But at the same time, it caused a rough picture.

Therefore, noise control ability has become an important criterion to measure the quality of the camera. The average home digital camera has a very weak ability to handle noise, and if the sensitivity is set to 200, you can see that there is obvious noise, and the picture above 400 is basically impossible to see. Therefore, for home cameras, the use and significance of high sensitivity are not great.

For DSLR cameras, it is easier to achieve noise control due to the large area of the image sensor. Therefore, the maximum light sensitivity reaches 125,600 or even higher. At 1600 sensitivity, image quality is still very good.

The sensitivity can be understood as the sensitivity of the sensor Aperture When the shutter is the same, the higher the sensitivity, the brighter the picture In a darker environment, when the aperture can not be larger, you can only slow down the shutter or increase the sensitivity, but the shutter will be blurry at this time, and increasing the sensitivity has become the only way.

High sensitivity allows you:

1. Get a clearer image in a low-light environment.

2. Obtain a more stable image of high-speed moving objects.

It is used for indoor shooting or shooting scenes such as night scenes or sports, and the effect is better than low sensitivity.

The sensitivity refers to the sensitivity of the index code camera processor to light, the higher the sensitivity of the reed, the stronger the sensitivity to light, the lower the sensitivity, the lower the sensitivity to light. In film cameras, it refers to how sensitive the film is to light. The English symbol of sensitivity is ISO, and the sensitivity of general cameras is ...... from ISO100 and ISO200ISO1600, ISO25600, etc.

The higher the posture number, the higher the sensitivity. But the higher the sensitivity, the more dry spots there are in the image.

The higher the sensitivity, the stronger the sensitivity to light, the lower the sensitivity, and the lower the sensitivity to light. In film cameras, it refers to how sensitive the film is to light. The English symbol of sensitivity is ISO, and the sensitivity of general cameras is ...... from ISO100 and ISO200

ISO1600, ISO25600, etc. The higher the number, the higher the sensitivity. However, the higher the sensitivity, the more dry spots there are in the Hail image.

1. Sensitivity, originally refers to the film's induction speed to light, that is, the chemical reaction speed of the film's silver salt particles, the higher the photosensitivity of the first fiber code, the slower the photosensitivity (silver salt particle reaction) speed of the film, such as 100° film (film ° film, 400° film, etc., the larger the number, the slower the induction speed, which can be used when the light is relatively poor. The digital age has adopted the name sensitivity;

2. The sensitivity of the SLR camera (including vertical difference and other digital imaging equipment) is a program to amplify the charge signal, which is one of the programs of the image processor to determine the amplification of the charge signal. The higher the sensitivity, the higher the amplification of the charge signal. In principle, it is not the same as the photosensitive speed of film;

3. There are two aspects related to the quality of digital imaging, one is the number of pixels, and the output frame or magnification size; One is pixel quality, which is related to imaging quality. Among them, the signal-to-noise ratio determines the quality of the pixel;

4. The signal-to-noise ratio refers to the ratio of the effective signal to the invalid noise, and the signal-to-noise ratio is determined by the sensor's standard and ADC (analog-to-digital conversion) technology, and in the case that the system and ADC are basically the same, the pixel density is affected by the signal-to-noise ratio;

5. Once the SLR is designed, the signal-to-noise ratio is fixed, the effective signal and invalid noise of the charge signal are also fixed, and the charge signal also includes the brightness signal; Setting different sensitivities is to determine the different magnification of the charge signal;

6. Regardless of high sensitivity and low sensitivity, the pixel quality of the same device is the same. When the ambient illumination is poor, the light obtained by the photosensitive layer of each single pixel (i.e. photodiode) is poor, and the generated charge signal is weak or even very weak. In order to ensure the effectiveness of the charge signal, such as to achieve brightness visible to the human eye, a greater amplification of the charge signal is required.

Once the charge signal is amplified, the noise in the signal is also amplified, and the noise is more obvious. The low inductance amplification is low, and the noise in the signal is not easy to detect, but the noise is still these noises, and there is no physical change. At the same time, the higher the sensitivity, the higher the brightness of the amplified signal, and the higher the brightness of the picture, which affects the reciprocal rate of the aperture and shutter;

7. In a word, digital sensitivity is the degree of amplification of the charge signal.

You can adjust the sensitivity, and the influence of the sensitivity on photography is tabled in two aspects. One is speed, which is easy to understand as a faster shutter speed with higher sensitivity. The second is image quality, the lower the sensitivity, the more delicate the image quality, while the higher the sensitivity, the more noisy. Generally speaking, it is appropriate to maintain the sensitivity below 800.

Adjust the shutter time of the sock festival, and the shutter speed is in "seconds". Common shutter speeds are: 1 1 2 1 4 1 8 1 15 1 30 1 60 1 125 1 250 1 500 1 1000 1 2000 etc.

The longer the shutter time, the more light will enter, but if the time is too long, the jitter will blur.

Other contents: Leadership attention is the premise of HSE management, and the implementation of the safety production responsibility system is the key to HSE management. From the bidding of a project to the commencement of the project, all parties to the project should make corresponding HSE commitments and establish corresponding HSE responsibilities, and the project owner should always take HSE management as an important task.

In this way, the "safety first" has been formed in the minds of all employees.

1. The concept of "prevention first" makes employees aware of the importance of HSE work and lays a good foundation for future work. Establish integrated HSE management. First, HSE risk management technology and management system are integrated, and scientific and effective management technology is used as the support to ensure the implementation of the corresponding management system; The second is the integration of HSE management and the project development process.

HSE risks exist throughout the construction of a project, so it should be viewed with holistic HSE management throughout the project and improved as the project progresses, rather than being phased out. In order to implement the safety production responsibility system, the Yuji Project Management Department set up an HSE management committee at the beginning of its establishment, and issued management documents such as "Quality and HSE Reward and Punishment Measures", "QHSE Work Arrangement", "QHSE Punishment Implementation Rules", "Safety and Civilized Construction Regulations", etc., requiring all construction units to implement safety.

Although high sensitivity can make ** brighter, the noise that comes with it also makes many players avoid high sensitivity, so when can you use high sensitivity first? Let's take a look at 4 situations where you can make good use of high sensitivity, and I hope it will be helpful to you.

1. When you want to solidify the ultra-fast action

When photographing sports, cars, pets, or even birds, the target may move very quickly, even with a wide-aperture lens'The light may not be enough to get you at a high shutter speed (you may need to use a shutter speed of 1 8000s), so increasing the ISO is the most convenient way to do this. Increasing the ISO can also prevent the aperture from being opened to the maximum, which not only maintains a certain depth of field, but also improves the quality of bright closed photos.

With ISO 3200, the shutter speed can be increased to 1 2500s to photograph birds in flight.

2. When you want to take photos of the starry sky

When shooting at night, many students will think that after the cute feet are outstanding, the aperture can not only be narrowed, but the ISO can also be set to the lowest, just let the shutter stay open**. Of course, this is fine when shooting still photos, but when shooting a starry sky, if the shutter is wide open, it will capture a starry track instead of a starry sky. Therefore, the shutter speed should not be too long, and not only should you use a large aperture lens, but you also need to increase the ISO, and sometimes even ISO3200 to make the starry sky stand out.

3. When shooting handheld in a dark environment

If you don't want to shoot blurry photos with hand shock, it is best to have a shutter speed higher than the safety shutter (except with anti-hand shock function), and increasing the ISO is a very effective way to maintain depth of field, so it is better to use a digital camera to improve the function of the ISO.

Fourth, when using a telephoto lens

When using a telephoto lens handheld, the shutter speed must be fast enough to keep the photo sharp, and increasing the ISO can effectively increase the light sensitivity and maintain the aperture to make the shutter faster, so it is not too much to use ISO when using a telephoto lens.

The International Standards Organization (ISO) defines light sensitivity as the speed at which a film reacts chemically to light, and is also the standard for the speed of light sensitivity in the film manufacturing industry. the sensitivity of the film (film) to light; Low sensitivity refers to soft film (film) with ISO 100 or less, medium sensitivity refers to ISO 200 800, and sensitivity is ISO 800 or higher compared to high sensitivity. For example, ISO 200 can be used for cloudy days, ISO 400 or higher for dark environments such as stage and concerts, and digital cameras have a similar function, which changes the ISO value by changing the magnification of the signal amplifier in the sensor chip, but when the ISO value is increased, the amplifier will also amplify the noise in the signal, resulting in coarse and fine particle images.

What is ISO?The great god of photography popularizes the sensitivity and his understanding of photography!

Light sensitivity is the sensitivity of the camera's CCD sensor to light.