The Camera - ISO

 What Is ISO?

ISO is the third and final part of the exposure triangle, ISO in DSLR's is how sensitive the camera is to light coming in. Low ISO would mean low sensitivity to light, and so for a picture to be properly light, a slow shutter speed and a low f-stop would be needed. As ISO increases, the grain in the image increases, as the digital sensor in the camera is becoming too sensitive to light. Lower ISO would be good for properly lit environments, with a slow or no movement image. High ISO is great for nature and sports shots, because it allows for very quick shutter speed.

Below are two pictures I took at 9pm in my backyard. The first picture had max ISO of 25600, an f-stop of 7.2, and a shutter speed of 25 seconds. With those conditions the picture is fully lit. The second picture had an ISO of 100, 30 second shutter speed, and a f-stop of 5.4, and the picture is near pitch black.







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