Finding the right ISO for digital cameras

The world used for cameras ISO figure comes from the 1970s, when the “International Organization for Standardization” (ISO) specified a fixed standard. This number is important especially for cameras, since it determines the light sensitivity of the device. The following applies: A higher ISO speed also means a higher sensitivity of the sensor. Similarly to the exposure time of a camera also applies here that a doubling of the number means a doubling of the sensitivity to light. Modern cameras usually allow a range of ISO 50 to ISO 6400. But what mistakes should be avoided and which setting is optimal for everyday photography?

An appropriate ISO select number

In modern SLR number increasing the ISO is easy with an electronic amplifier, finally falling still as much light as before on the sensor. The electronic device then amplifies this however. In addition, the ISO number should always be chosen so that it is complementary with the other settings of the camera: Who, for example, halved the ISO number, but at the same time doubling the exposure time, which is at least able to see any difference in light. In principle, therefore, these two settings should just be matched and never changed simultaneously when a suitable setting to be found by trial and error.

But not only the exposure is changed by adjusting the ISO, in another area, it affects: For analog cameras, the previous time she made in higher areas in an image, the “grain” seemed a little, nowadays when digital models brings however a noise with them when a higher number is set – ultimately brings the electronic gain their disadvantages. Newly generated models can shoot 1,600 problems sharp images to ISO, then however the image quality begins to suffer. It should therefore always be a number chosen which is as low as possible and as high as necessary. maybe Who more light when shooting an image so requires, but already a comparatively high ISO used number, should first adjust and see if the image is blurred or whether it can still be done by hand, the exposure time.

Select the proper exposure time

Normally cameras offer settings for the exposure time, which ranges from 1/8000 to 30 seconds, but the border is just in the short exposure times are often not quite as short – even 1/4000 or 1/2000 is often just on entry level vehicles to be found , A doubling of the exposure time also means also that comparatively twice as much light falls on the sensor. Finding the right attitude is so important because it determines whether objects appear blurred or can be seen in clear focus. Particularly with objects that move, this is very important – that animals, humans or rivers, as well as stars and flowers in the wind are affected. Basically, taking pictures by hand requires very short exposure times, which should definitely be less than a second. 1/30 makes sense often is even recommended as average Everyday Photo 1/100 or 1/200.


Of course, the perfect exposure time depends on other factors: What focal length is used, an anti-shake on the lens is present and how quiet the user can keep his hands when taking pictures? Accordingly, it should be played and tried with setting something so that optimum images can arise. In addition, the ISO and aperture play an important role and should always be aligned in conjunction with the exposure time. Those who do not find the perfect setting for my camera, which can at professionals such as ask and allow short advice. Only then it is guaranteed that the incident light actually enables clear, crisp images and not too dark or too light.

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