There are many questions related to ISO and understanding exactly what it is and how it works is a complex task.
If you have not used it before, the ISO in your camera setting will probably be a mysterious entity.
What is the best setting for ISO to get perfect shots? When low ISO is preferred and when is high ISO preferred? Basically, ISO is one of the important elements in the exposure triangle which helps to produce crystal clear images.
Lighting [Lighting Techniques] is the most important element in photography as photography is all about capturing light on the photographic sensors. ISO is the sensitivity of light on the digital sensors that captures light.
This article stacks up the important information regarding ISO and makes you understand ISO importance in pictures and its use in avoiding grain shots.
What is ISO?
In a nutshell, ISO is the measure of camera sensors sensitivity to light. For example, imagine that you are standing in sun, the frequency of sun is harsh and by wearing sunglasses you are controlling the sun effect. Once you wear the sunglasses, your eyes get adjusted to the sun again.
If you remove the glasses your eyes return to their normal state. Wearing sunglasses desensitizes the sun’s effect; this is known as low ISO and removing sun lasses can be likened to high ISO.
Higher ISO means the camera sensors are too sensitive to light and can capture images in low lighting conditions and vice versa in low ISO.
Change in ISO:
ISO on photographic sensors has a wide range: 100, 200, 400,800, 1600, 3200 etc. If you set the camera in low ISO, the image sensors are not too sensitive to the lighting. On the other hand, if you set the camera in high ISO then your camera sensors are too sensitive to lighting and can click images in dark or poor lighting conditions.
100 ISO is considered as normal ISO range and can produce crystal clear shots without any grains in the shot. As you increase the ISO, you will see grains/noise in the pictures which are caused by lighting sensitivity on camera sensors.
If you want crystal clear/smooth/grain-free images, stick to low ISO. Many cameras have automatic ISO settings and the camera gets adjusted according to the lighting requirements in the picture.
Some cameras give you the flexibility of changing the ISO settings; if you need to change the ISO settings you need to query lighting adjustments. If you have poor lighting, you need to set a high ISO to get good pictures in low lighting.
High ISO settings are preferred when you are clicking images of indoor sports, art galleries, concerts and churches, as all these are no flash zones. This is also true for parties where using a flash can produce blow-out in images.