In case you are an amateur photographer and aims to take superb photographs, you certainly need to be well aware of camera ISO, its purpose, working etc. ISO, along with Aperture and Shutter Speed is one of the most vital elements to get the know-how of in photography world. Following are some of the basic facts given about ISO to let all of you know a bit about it.
ISO, in the simplest words is actually the extent of sensitivity of your camera to the light. The ISO number directly determines the sensitivity of a camera; the higher the number the more will be the sensitivity of the camera. Now the sensitivity can be altered by getting a good quality sensor.
Sensor is usually pretty expensive and its function is to transform the light, collected into vivid pictures. Higher sensitivity of the camera allows you to take photos even in dim light areas. However, the only drawback of the higher ISO is the increased noise that you have to bear.
Normally, you will find a “Base ISO” with almost every camera, coming out these days. It is the least ISO number of the sensor which can take photos of superb quality. The Base ISO on the Nikon cameras is usually 200 and in Cannon, it usually is of 100. Make sure, you keep this factor in mind, in case you want to get images of superb quality.
Usually the Base ISO numbers begins from 100 and goes like 200, 400, 800, 1600, 3200 etc. As the numbers gives an idea, with every doubled figure, the sensitivity of the sensor also increases. The more sensitive the sensor is, the least time it will require to take the image. For instance, suppose an ISO 100 takes 1 second to take an image, with ISO 200, the time will be decreased to ½, for ISO 400, the time will be further reduced to 1/4 and so on. Now this difference means a lot in the world of photography as it plays a major part in freezing the motion of an object that can produce dramatic effects.
In case you are doing indoors shooting, better increase the ISO since this helps the camera in taking pictures at a fast speed. Plus, will also create vivid images by freezing the motion. Aside from this, you will also need to increase the ISO, in case you are doing bird photography where you need to take shots quickly. However, keep in mind that an increased ISO means you will have to bear the grain or noise as well so see, if you can afford it or not.
You can find “Auto ISO” option on most of the latest DSLR’s available in the market today that functions wonderfully in dim light areas. The flexibility this setting offers is that you can set the upper limit of the ISO number yourself so that regardless of ISO getting increased on its own, it never goes beyond the set limit. This way you can also control the noise that increase with the higher ISO number.