If you set the aperture at a higher number, your camera will let in less light. When you change the f-stop on your camera, you decide how big or small your aperture will be for a particular photo. Most people just learn the f/numbers off-by-heart without really understanding their meaning. The feature is usually marked with f-numbers on your camera, which is where its name comes from. If you take a picture and its too dark at f/5.6, would you choose a lower f-stop number or a higher one Yep Youd choose a lower f-stop number, which opens.
This sound like a drag to calculate each time, and it is. If you wanted to let in 1-stop less light, you would multiply 5.6 by 1.4 to get 8, use f/8. So if you were using at f/5.6 and you wanted 1-stop more light, you would divide 5.6 by 1.4 to get about 4, so you would use f/4. A change of 1-stop of light using aperture is called an f/stop. So, increasing the diameter of lens opening by 1.4 will let in 1-stop more light, and reducing it by 1.4 will let in 1-stop less! Just to make a little bit harder, the f/number is inversely proportional to the area, meaning the higher the f/number the less light it lets in.
#F STOP VS T STOP ISO#
Unlike shutter speed and ISO where you can double or half to increase or decrease by 1-stop of light, for aperture it is in multiples of 1.4!!! This is because lenses are circular, so if you want to double to area of a circle you increase the diameter (and radius alike) by 1.4 (flashback to school maths anyone?). The aperture of a lens is denoted by an f/number, which corresponds to how much light the lens lets in. Up until now, it has been fairly straightforward, but alas, here we are with aperture.
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