September 2012
Beginner to intermediate
320 pages
8h
English
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Exposure Basics
When the shutter-release button is pressed, light is allowed to reach the sensor and a photograph is produced. Three things control how much light reaches the sensor: The amount of time the shutter is open (shutter speed); how much light is allowed to pass through the lens (aperture); and how sensitive the camera sensor is to light (ISO).
Using these three ways to control the amount of light that reaches the sensor can produce the look you want in your images. If too much light reaches the sensor, the image is too bright, and the details in the bright parts are lost. This is called an overexposed image. When too little light reaches the sensor, the image is too dark and the details do not appear in the dark areas. This is called an underexposed image. The goal is to allow enough light to reach the sensor so that there is detail in both the bright and dark areas.
It’s important to understand standard terminology about exposure. The shutter speed is described using a measure of time—most often in fractions of a second. For example, for Figure 6.1, the shutter speed was 1/250 second. Aperture is described using the term f-stop. For Figure 6.1, the f-stop was f/8.0, which describes the size of the camera’s aperture during the 1/250 second the shutter was open. The ISO has a standard numerical value that is the same across all cameras.
6.1 This photo has detail in both ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.