![]() ![]() This means that we can easily swap these three components about while keeping the overall exposure the same. The great thing about stops is that they give us a way to directly compare shutter speed, aperture diameter, and ISO speed. Changing from f/16 to f/11 is an increase of 1 stop because 11 = 16 / 1.41.Īs with shutter speed, most cameras let you control your aperture in 1/3 stop increments. A lower f-number relates to a wider aperture (one that lets in more light), while a higher f-number means a narrower aperture (less light).īecause of the way f-numbers are calculated, a stop doesn't relate to a doubling or halving of the value, but to a multiplying or dividing by 1.41 (the square root of 2). For example, going from f/2.8 to f/4 is a decrease of 1 stop because 4 = 2.8 * 1.41. Moving from ISO 800 to ISO 400 is a 1 stop decrease. Most cameras let you change ISO speed in increments of 1 stop.Īperture is measured using the "f-number", sometimes called the "f-stop", which describes the diameter of the aperture. As with shutter speed, doubling the ISO number gives an increase of 1 stop, while halving gives it a decrease of 1 stop.įor example, switching from ISO 100 to ISO 200 doubles the sensor's sensitivity, producing a 1 stop increase. ISO is measured using values that correspond to the ASA scale for film, with a higher ISO number relating to a more sensitive sensor. A more sensitive sensor will produce the same overall exposure from less light, meaning that you can use a narrower aperture or faster shutter speed in the same conditions. ISO speed describes how sensitive your camera's sensor is to the light that hits it. ![]() Most cameras allow you to adjust shutter speeds in increments of 1/3 of a stop, so 3 turns of the dial either way will adjust your exposure by 1 stop. Similarly, going from 1/60 to 1/30 lets in twice as much light, giving a 1 stop increase in exposure. The longer it's open, the more light it lets in, and the greater your total exposure will be. Doubling or halving your shutter speed produces an increase or decrease of 1 stop of exposure.įor example, changing from 1/100 of a second to 1/200 lets in half as much light, so we can say we've decreased the exposure by 1 stop. Shutter speed measures how long your camera's shutter is left open during a shot. These are all measured using different units, so the concept of "stops" was invented as a convenient way to compare them. ![]() The amount of light captured while taking a photo is known as the exposure, and it's affected by three things - the shutter speed, the aperture diameter, and the ISO or film speed. However, it's actually very simple:Ī stop is a doubling or halving of the amount of light let in when taking a photo.įor example, if you hear a photographer say he's going to increase his exposure by 1 stop, he simply means he's going to capture twice as much light as on the previous shot.Ī stop is a measure of exposure relating to the doubling or halving of the amount of light. In photography, a "stop" is a widely misunderstood concept, feared by many because it sounds so complicated. ![]()
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