We already know depth of field blur, but what about motion blur? When the camera opens it’s shutter, it makes a permanent impression on the film (or digital receiver). To begin on this example, we have to know what causes blur. We want to show movement, and encourage blur in the water. If we take a picture with the settings in the previous example, we would see droplets of water frozen in time. We want to show the water as moving and flowing.
#Aperture vs f stop iso#
Photo by georgemoga ISO 100, f/4.0, 5-second exposure. Bottom line: Quick shutter speed = smaller F-stop number = more light being let in (larger opening) = less in focus (smaller depth of field) = frozen time, focused subject, blurred background. This would also mean that we have a diminished depth of field. A quick shutter speed would also mean a smaller F-stop. We would want a quick shutter speed, because a slow shutter speed would capture too much light, essentially capturing too much in time, blurring the shot. Let’s say, for example, we want to make a car or a fast moving person appear to be frozen in time, with no blur.
#Aperture vs f stop how to#
So how to we go about making special effects? By the same coin, larger F-stops (smaller opening) are great for landscape shots, where there is huge landscape that is the main subject. This means that smaller F-stops (larger opening) are great for portraits, where the main subject of the photo is a person.
How much of what’s in front of you that’s in focus is called depth of field.Ī smaller F-stop will have a faster shutter speed, thus it would have less of a depth of field than a larger F-stop. This same principle applies to- you guessed it, the F-stop. However, if you leave your eyes open, much more may be in focus. If you open and close your eyes quickly, you can not see very much, and only what’s immediately in front of you may be in focus. Opening and closing a shutter is like opening and closing your eyes. Less time is needed to create the exposure. A smaller opening means less light is reaching the film, so it needs more time to create a picture or exposure.Ī smaller F-stop number (remember, larger opening), requires a faster shutter speed. Naturally, a larger F-stop number (remember, smaller opening), requires a slower shutter speed. With each F-stop, the shutter speed will increase or decrease in step. It is directly dependent on the aperture and the F-stop, because the amount of light entering the camera through the aperture determines how long the shutter remains open. Shutter speed is simply the length of time that the shutter remains open to let light hit the film. Remember, the aperture controls how much light enters, and the shutter lets that light hit the film.
The shutter is what lets light hit the film (or digital receiver). Photo by Deraman Uskratzt ISO 400, f/1.8, 1/1250-second exposure.Īperture goes hand and hand with the shutter.
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