The exposure triangle is a common way of associating the three variables that determine the exposure of a photograph: aperture, shutter speed, and ISO. One must balance all three of these to achieve a desired result, an adjustment of one requiring adjustments of at least one of the others.
Side 1: Aperture
•Aperture is a measure of how open or closed the lens’ iris is. A wider aperture (or lower f-number) means more light will be let in by the lens, simply because the opening is larger. A narrower aperture allows less light to reach the sensor. Examples are down below:
•Aperture is a measure of how open or closed the lens’ iris is. A wider aperture (or lower f-number) means more light will be let in by the lens, simply because the opening is larger. A narrower aperture allows less light to reach the sensor. Examples are down below:
Side 2: Shutter Speed
•Shutter speed is a measure of how long the shutter remains open and thus, how long the sensor is exposed to light. Faster shutter speeds give the sensor less time to collect light and thus, result in a lower exposure. Slower shutter speeds allow more time for the sensor to collect light and result in a higher exposure.
•The reason photographers might want to use a higher shutter speed is to stop motion, whether that be camera shake or a subject that is moving, allowing to maintain sharpness.
Side 3: ISO
•Increasing the ISO essentially allows you to work with less light.
• Increased ISO's result in increased noise and less detail.
•So, why ever use a high ISO? Often, when working in lower light, you will find yourself at a point where you are using the widest possible aperture and the slowest shutter speed you can to stop action. At this point, your only choice is to increase the ISO. The lens cannot physically open itself any wider and as discussed above, sacrificing sharpness for a slower shutter speed is rarely advisable. I would rather have a grainy image that shows a well-defined subject than a smoother image with a subject lost in blur. Down below are example pics of ISO.
•Increasing the ISO essentially allows you to work with less light.
• Increased ISO's result in increased noise and less detail.
•So, why ever use a high ISO? Often, when working in lower light, you will find yourself at a point where you are using the widest possible aperture and the slowest shutter speed you can to stop action. At this point, your only choice is to increase the ISO. The lens cannot physically open itself any wider and as discussed above, sacrificing sharpness for a slower shutter speed is rarely advisable. I would rather have a grainy image that shows a well-defined subject than a smoother image with a subject lost in blur. Down below are example pics of ISO.