The reason both are used is simple: Aside from controlling the amount of light, they give different effects: What is the relationship between the aperture and shutter?īoth aperture and shutter let light in (or block it out) – in a controlled manner. You can call it shutter duration or just shutter. Maybe this is why people call it shutter speed. However, the word ‘speed’ (as in film speed) is related to the sensitivity of light. Why do people call it shutter speed and not shutter duration? Shutter duration is measured in seconds, minutes and hours – whatever’s convenient. You decide how much time the shutter stays open. What is Aperture and F-Stop? What is shutter?Ī shutter is a ‘second aperture’, but with a timer on. Now that you’ve understood what an aperture is, go into slightly more detail here: Cinematographers who light film sets also talk to their gaffers in terms of stops. Greater accuracy than that isn’t required.Ī serious student of photography and cinematography is encouraged to think in terms of stops.
#ISO AND F STOP ISO#
The f-stops, the ISO and shutter speeds are all controlled in stops, half stops or a third-stop at most. A stop higher is 200 lux, and a stop lower is 50 lux. E.g., if 100 lux is light falling on a table. You can also have half stop increments and a third-stop increments.Ī stop is double or half the light. F-stops are numbers where each subsequent number is a stop higher than the previous one. Why are f-numbers called f-stops?į-numbers can be any number: 1, 2, 3, 456, 7 million, anything. E.g., f/1.4 is a larger aperture (more open) than f/16 (more closed). The larger the aperture, the smaller the aperture. The ‘/’ is to show the numbers are inversely related to the size of the aperture. The ‘f/’ is to show these numbers refer to the f-number and are not to be confused with the numbers on the focus scale. When you want less light in, you ‘close down’ or ‘stop down’ the aperture. When you want more light in, you ‘open up’ the aperture. The beauty of this gate is that you can vary the size, thereby letting more or less light in. What is aperture?Īperture or Iris is the ‘gate’ that blocks light from hitting the sensor. The exposure triangle is just a way of saying the aperture, shutter and ISO are all related to each other.īut – the triangle has nothing to do with it.Įven as a symbolic thing, it’s more confusing than enlightening.
#ISO AND F STOP HOW TO#
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