Why increase the sensitivity if it hurts image quality?

Because the amount is related to three elements.

It is proportional to the time (shutter), to the reciprocal of the square of the aperture value, and to the sensitivity.

The higher the sensitivity, the worse the image quality is, but many times the sensitivity has to be increased, mainly to ensure shutter speed and sufficient depth of field.

Here are a few examples:

1.When shooting handheld, you need to reach a safe shutter to not paste, even if there is image stabilization, you can only lower the shutter speed by 1 to 3 stops, still to ensure the shutter speed, if the light is not good, and the aperture is not large enough, it is natural to open the high sensitivity, otherwise it is meaningless to shoot with low sensitivity and good picture quality, and if the light is very dark, even if it is a large aperture, you have to open the high sensitivity, but the sensitivity can be lower than that of a small aperture.

2.When shooting macro, the actual aperture T value will be less than the nominal aperture F value, so the amount of light will be reduced, and the macro depth of field for SLR shooting is very shallow, and the aperture needs to be reduced, and the macro has relatively high requirements for shutter speed, and it is easy to paste the film in hand, so it is natural to ensure the shutter speed, and even if there is a tripod, but there is a breeze or the object is moving, the shutter speed must still be guaranteed.

3.When shooting moving objects, it is also necessary to ensure the shutter speed, which cannot be solved by tripods and stabilization.

Improves sensitivity, 1It can reduce the aperture and increase the depth of field; 2.It is also possible to shorten the shutter time and shoot moving images.

Because: the light is dark or the pursuit of a certain effect.

There are two main aspects of the influence of light sensitivity on photography

1. Speed, higher sensitivity can get faster shutter speed;

2. Image quality, when the sensitivity is lower, the more delicate the image quality will be. The higher the sensitivity, the greater the noise of the image quality, that is, the lower the clarity of **.

Sensitivity, also known as the ISO value, is a measure of how sensitive a film is to light. The sensitivity can effectively improve the brightness of **, and when the picture in the camera is too dark, the sensitivity can be turned up, which can effectively solve the problem of low brightness of the picture. For example, when the camera parameters are displayed as: , 1 160 seconds, ISO400", you can find that the picture in the camera is relatively dim, at this time, you can adjust the sensitivity to "ISO1000" without adjusting other parameters, so that the color of the picture can be brightened and the color is more vivid.

However, it is important to know that only increasing the brightness by adjusting the sensitivity will increase the noise of the dim image. Therefore, this simple setting method is not suitable for shooting in too dark environments.

It can be reconciled according to the degree of **. It has a very good impact on the photographic effect, which can make the color more vivid, can increase the brightness, can make the color more full, and can make the color more shadowy.

Adjust according to the angle of the shot. It will affect the texture of the photo, it will affect the effect of the shot, make the image look dark, the effect of the shot is not good, and there are many requirements when taking pictures.

At this time, it should be adjusted according to the light, and then it should also be adjusted according to the angle of shooting, as well as the time of shooting, the impact is relatively large, and it will also affect the effect of the finished film, and it will also affect the overall layout.

<> "Camera Basics--**Three Elements - Sensitivity.

What is Sensitivity?

Sensitivity: Sensitivity, also known as ISO value, is the sensitivity of the film to light, and for the digital camera, it is the sensitivity of the sensor (CCD CMOS), which is the sensitivity to light. By changing the ISO value, you can adjust the sensitivity.

The effect of light sensitivity on image quality.

The better the image quality, the smaller the sensitivity value, the more delicate the picture judgment, and the less noise. The worse the image quality, the higher the sensitivity value, the rougher the picture, and the more noise.

The effect of light sensitivity on light and shade.

With the same aperture and shutter speed, we can conclude that the lower the sensitivity value, the lower the perceived light sensitivity, and the darker the image. The higher the sensitivity value of the coarse grip, the higher the sensitivity of perceived light, and the brighter the picture.

Summary of sensitivity knowledge.

The lower the sensitivity value, the lower the perceived light sensitivity and the darker the image. The higher the sensitivity value, the higher the sensitivity of perceived light, and the brighter the image. The better the image quality, the smaller the sensitivity value, the more delicate the picture, and the less noise; The worse the image quality, the higher the sensitivity value, the rougher the picture, and the more noise.

The higher the sensitivity key core, the better the image quality and the better the history. （）

a.That's right. b.Mistake.

Correct answer: B

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.

1) The sensitivity is the ISO parameter on the camera, the sensitivity is simply the camera's ability to sense light, now the sensitivity of the digital camera can be adjusted with the shooting environment at that time, generally when the light is good, you can lower the camera sensitivity, let more light enter the camera, so that the camera shoots better shooting results, and at night or when the light is bad, increase the sensitivity, so as to improve the shooting speed of the camera, to ensure that the camera will not be blurred, The above is the main role of the camera's sensitivity.

2) The sensitivity is the speed of light sensitivity, which has a sensitivity ...... for previous filmsThe larger the number, the faster the sensitivity, such as ** at the same time, then 400 will be much brighter than the effect of 200, so we will use a slightly higher sensitivity at night, and we will use the sensitivity at the bottom during the day.

3) As for the impact on the quality of the photo, the faster the sensitivity, the higher the possibility of noise, so in principle, it is better to use the lowest sensitivity, and only increase the sensitivity when there is no way, such as when the light is not enough (when the aperture shutter is not satisfied).

The same is true for digital, at present, the general camera is still not ideal in terms of high sensitivity, but the SLR camera has a more satisfactory effect, and some can be opened to 1600 without obvious noise.

4) The role of high sensitivity and low sensitivity. Since the improvement of the industrial so can effectively reduce the CCD sensitivity time, it provides convenience for us to shoot in low light. Because it usually takes a long ** time to shoot in low light or at night.

Once the time is too long, the shaking of the hand can easily affect the sharpness of the shot, and the only way is to use a tripod to fix the camera. But after all, for most users, it is not convenient to carry a tripod out for entertainment at any time. In addition, sometimes it is some emergencies that occur at night, and the most direct way to get a brighter shooting effect is to use a high engineering SO value, so that the shooting effect will be better.

The high-tech SO value is suitable for scenarios such as night scenes, low-light environments, and fast snapshots.

5) It is not that the higher the sensitivity, the better, because although the brightness of ** with a small ISO value is the weakest, its image quality and delicacy are the best. And the ** grain feeling that is too high is the most obvious, and the noise is more. Therefore, the higher so settings are not suitable for digital** that require higher quality, especially for portrait shooting, still life shooting, and close-ups.