The next shutter speeds would also be be either double or half, and then so on. They decided that the sequence of standard shutter speeds should be either double the amount of time or half the amount of time, depending on the direction the shutter was set. In the earliest inventions of the mechanical shutter, somebody made a very, very good decision. In fact, if you have a very long shutter speed, the second curtain might not even begin to travel to cover the sensor until maybe long after the first curtain has fully revealed it. The slower the shutter speed, the greater the space. Really doesn't matter, this is just the example we're using here. Some cameras, the shutter moves from left to right or right to left. And of course, the subject is upside down because that's the way they would appear on the sensor, with the light passing through the lens, reversing. Now, in my example here, we see the shutter going from top to bottom. The faster the shutter speed, the narrower the space between the two shutter curtains as they move across the focal plane in between the sensor and the lens. And the sooner that second curtain begins to sort of chase the first curtain, in other words, the smaller the space between them, the less time each pixel will be exposed to light, and the shorter the shutter speed. So what is this shutter speed? Well, shutter speed is the amount of time that each individual pixel is exposed to light. We learned in the previous lesson about the focal plane shutter, how it consists of two curtains that move, one following the other with a little space in between, maybe sometimes a big space, so that the whole sensor is exposed to the same amount of light, but not all at once. Shutter priority, often known as Time value (Tv) uses a fixed shutter speed while modifying aperture stop in order to get the best exposure while aperture priority, also known as Aperture value (Av), varies the shutter speed while maintaining a fixed aperture stop.Okay, welcome back, we're going to be talking about shutter speed, and aperture, and exposure together, so let's get going. If you simply want to use a certain aperture or shutter speed without needing to adjust the other one, you can select a semi-automatic setting for the camera. On the other hand, slow shutter speeds or long exposures, can result in very dramatic and artistic effects. A fast shutter speed is essential when capturing moving objects in order to prevent blurring due to its motion. This is useful if you want to show an entire landscape or eliminate distractions in the background. A large aperture allows most of the image to be in focus while a smaller aperture blurs objects that are behind or in front of the subject. Changing aperture changes the depth of field of the image. Increasing the aperture one stop while reducing shutter speed one step would result in the same level of exposure making it very easy to change shutter speed or aperture size while still maintaining the correct level of exposure.Īlthough the correct exposure can be achieved with different values of aperture and shutter speed, it is often desirable to have a specific value. Due to many years of evolution of the technology, the levels to which you can adjust these two have been standardized in relation to each other. Too big an aperture or too slow a shutter speed results in an overexposed image while the opposite results in an underexposed or very dark image. These two are used to control the exposure level of the image. A slower shutter speed means that the shutter is open longer and more light would be able to hit the sensor. When you press the button to take a photo, the sound that you hear is from the shutter opening and closing. On the other hand, shutter speed is the rate at which the shutter opens and closes. Aperture is basically the size of the opening that lets the light into the body a bigger opening result to more light entering and hitting the sensor. Aperture and shutter speed are two factors that can be controlled within the camera. In photography, there are a lot of factors that contribute to the quality of the image.
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