A renowned photographer Bryan Peterson eskposur easily explain the concept in his book titled "Understanding Exposure".
About illustrations of the three elements that must be known to understand the exposure, he named the three as a triangle hunbungan Photography. Each element is associated with light: how light entering and interacting with the camera.
These three elements are:
I. Iso
By definition of the ISO is a measure of the level of the camera sensor sensitivity to light. The higher the ISO setting the more sensitive we terhada light sensor.
To get a clear picture of the ISO setting on our camera (ASA in the case of photographic film), just think about the bee community. An ISO is a worker bee. If my camera set at ISO 100, it means I have 100 worker bees. And if my camera set at ISO 200 means I have 200 worker bees.
The task of each worker bees is to collect light coming through the lens of the camera and make pictures. If we use the lens aperture is identical and we both set at f/3.5, but I set my ISO at 200 while your 100 (think again about the worker bees), then the picture who would have finished faster?
Broadly speaking, when we increase the ISO setting from 100 to 200 (the aperture is always constant - we lock the aperture at f/3.5 or through Aperture Priority modes - A or Av), we shorten the time required in making a photograph in the camera sensor we get half (2kali faster), from shutter speed 1 / 125 to 1 / 250 sec. As we add more ISO to 400, we cut the time of the photo until the other half: 1 / 500 sec. Each time you shorten the time esksposur as much as half, we call a raise esksposur for 1stop.
II. Apeture
The definition of the aperture is a measure of how much open lens (lens aperture) when we take photos. When we pressed the shutter button, the hole in front of our camera sensor will open, now was the aperture setting determines how big this hole is open. The bigger the hole open, the more the amount of light that will go unread by the censors. Aperture or the aperture is measured in f-stops. Often we read the terms of aperture / aperture 5.6, in more formal language of photography can be expressed as f/5.6. As disclosed above, the main function as the controlling aperture is how big the hole in front of the sensor is open. The smaller the f-stop number means the bigger the hole is open (and the more the volume of incoming light) and vice versa, the larger the f-stop number the smaller the hole open.
III. Shutter Speed
By definition, the shutter speed is the time frame when the shutter on your camera is open. More easily, shutter speed means less time in which our sensors 'see' the subject which we will photograph. Simply shutter speed is the time between we pressed the shutter button on the camera until this button back to its original position.
So easy, we translate this concept in some use in cameras:
• Setting the shutter speed by 500 in your camera mean time span as much as 1 / 500 (seperlimaratus) seconds. Yes, as short and sekilat it. As for the exposure time of 30 seconds, you'll see something like this: 30''
• Setting the shutter speed on your camera is usually in multiples of 2, so we'll see a row like this: 1 / 500, 1 / 250, 1 / 125, 1 / 60, 1 / 30 ff. Now almost all the cameras also allow setting 1 / 3 stop, so less is more movement of shutter speed that is more tightly; 1 / 500, 1 / 400, 1 / 320, 1 / 250, 1 / 200, 1 / 160 ... and so on.
• To produce sharp photos, use a shutter speed that is safe. Rules secure in most conditions is the setting shutter speed 1 / 60 or faster, so the resulting image will be sharp and safe from the results of the shaded images (blur / out of focus). We can outsmart this safe limit with a tripod or use the Image Stabilization feature (discussed in upcoming posts)
• Limit any safe shutter speed that is: we are shutter speed must be greater than our long lens. So if we use the 50mm lens, use a minimum shutter 1 / 60 sec. If we use the 17mm lens, use a shutter speed of 1 / 30 sec.
• Shutter speed to freeze motion. Use a shutter speed as high as possible that could be reached to freeze movement. The faster an object moves that we want to freeze the image, the faster shutter speed is needed. To freeze the movement of birds that fly for example, use the Shutter Priority mode and set shutter speed at the number 1 / 1000 sec (ideally ISO set to auto option) so that results are sharp. If you noticed, was idolized photographer sport mode S / Tv this.
• Deliberate Blur - shutter speed to show motion effects. When photographing moving objects, we can intentionally slow down the shutter speed us to show the effects of the movement.
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