The ISO is the measure scale of the sensor sensibility to light and its function is very important when we have to take a picture. Depending of your location, you have to configure it to get the best shot. Normally majority of digital cameras are coming with a preconfigured scene and auto ISO functions so you have nothing to do but they also include the manual mode which allows you to set yourself the exact configuration. Depending of your camera, you should have the following choices : ISO 25, 50, 64, 80, 100, 200, 400, 800, 1600 and/or 3200. A higher ISO is used when you have to shoot under |
bad light condition since it increases the sensor sensibility like a small street with few lights, a cloudy day… And in the contrary, a low ISO is used when you have to shoot under bright light condition since it reduces the sensor sensibility like a sunny day, a room highly lighted...
What does the camera it is to try to compensate the missing light or the extra light by slowing or speeding the shutter speed. This one will let in more or less light and by this way, it is increasing or reducing the risk of motion blur.
For example, you are in a room feebly lighted so your camera will try to compensate to let in more light by slowing the shutter speed. If after shooting you got a blurred picture, increase the ISO so your camera will select a higher shutter speed and thus to reduce this bad result.
The shutter speed is defined by the opening and closing time of the lens. Indeed, as light travels through the opening lens, the shutter opens and closes in a timed fashion to determine how long the picture sensor gets exposed to a scene. So more faster the shutter speed, better your photo without to be blurred. More longer it stays open (lower shutter speed), more the risk to capture a motion so to end up with a blurred picture.
By selecting a higher ISO you are allowing the camera to gather more light, this automatically forces the camera to select a faster shutter speed and to reduce motion blur.
In another hand, it is not good to use a high ISO in bad light condition for example because you will increase the risk to get a noise (known also “grain”) level - in a simple way, noise level is like when you make a zoom increasing more and more the picture to get a non-perfect photo. Normally it is recommended to setup a lower ISO whenever possible to reduce it. Below it is an example of photos taken in different ISO with a shutter speed of 1/100.
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So like you can read, between a blurred image or a noise level picture, you will have to balance those settings to get your best photo of course depending the effect you want to create. Following a table of ISO and example of conditions to use them.
| ISO settings | Condtions |
| ISO 25, 50, 64, 80 | Sunny day with blue sky, bright light room, landscape, portraits... Create fine detail and image quality. |
| ISO 100 | Sun, beach, snow... Create clean photo. |
| ISO 200 | cloudy day, overcast sky... Medium image quality with possibility of noise level. |
| ISO 400 | Indoor, night, with or without flash, sports, fast motion in low light condition... Photo with a compact digital camera is exposed to a noise level. |
| ISO 800 | Low light condition... Photo with a compact digital camera can be disappointing. |
| ISO 1600, 3200 | Concert, show, nocturnal... Highly noise level. |
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