When you pick up the camera – whether amateur or professional photographer, and whether you use film or digital cameras, will inevitably have to deal with the sensitivity. When the camera is unable to obtain sufficient amount of light, you can increase sensitivity to the value (or switch to high-speed film).
All the photographers are dependent on light, and light in different environments (time and place), the situation will be different. So that photographers can cope with different light sensitivity of the environment, it has become a very important tool.
For each photo, the speed will affect the choice of shutter speed and aperture. Such as rain forests, the corner or in the moonlight less the available light conditions, the sensitivity is probably not a tripod to shoot great pictures can only hope. This is why digital cameras make it easier for photographers to use was one of the reasons.
Sensitivity refers to the sensor’s sensitivity to light
According to the ISO sensitivity value, we understand the film or sensor to light the ability to feel. The sensor and ISO 100 ISO 200 compared to 2 times the amount of light needed to achieve the same exposure level. In order to get 2 times the amount of light needs to reduce by half the shutter speed (such as from 1/60s to 1/30s), or to increase an aperture (such as from f/5.6 to f / 4). Reduce the shutter speed is obviously not a good idea, this will increase the risk of blurred photos. So why can not we use the highest sensitivity has been set it?
Produce more noise, high sensitivity
The problem is caused by increased sensitivity will produce more noise, but in film photography, this is called “particles” of the things that will increase the photo is “feel.”
Not only is the noise
High sense of the problems brought about was not just noise. In fact there will be a total of three issues: increased noise, reduced sharpness, reduced contrast.
Compared with the noise, the latter two issues are usually not very noticeable. Increased noise will reduce the image sharpness, loss of detail. Reduce the contrast between light and shadow will affect the details of the high resolving power.
Noise is always negative it?
People spend a lot of time to study the low-speed and high sensitivity difference between photos. Hard to say which is more appropriate – some noise is not always a bad thing, might make more sense pictures.
Different cameras have different levels of noise
You will feel a sense of the test when the camera is high, photographs seem to have more noise?
Yes, the ability of the different cameras handle noise is different, but in recent years, the level of the camera’s high sensitivity is also a great development. If you use a portable digital camera, ISO 400 the noise and other camera ISO 3200 may be less the same level. And if you use the latest digital SLR cameras, even in ISO 800 or above are also available.
Now we may enlarge the photo on the screen to check the maximum size. But do not forget to evaluate the noise level should be the actual use of the photo sizes. Honestly, how many opportunities you will use more than the A4 photo?
I can tolerate the maximum camera sensitivity is how much?
Use your camera to shoot at different sensitivity settings of a group of photos in popular sizes check the noise level to determine the maximum sensitivity the camera can tolerate.
The role of the low sensitivity
In some cases, you must use a small speed. Here are three examples:
1. Need to use less than 1/2s shutter speed shooting water. The minimum speed needed at this time, if the tie can not meet the needs of the smallest aperture, you should also use the gray mirror.
2. In the sunny day outdoors, you need to use a large aperture (eg f/2.8) to obtain shallow depth of field. Most of the camera’s shutter speed can not exceed 1/4000s or 1/8000s, as the sensitivity is set to ISO 100 or 50. If you still can not meet the needs of you need to use the gray mirror.
3. Using the flash. Even if the minimum output, the brightness of the flash is also very significant. With a minimum speed, if the photo underexposed flash output can be increased.
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