September 2012
Beginner to intermediate
320 pages
8h
English
Content preview from Nikon D3200 Digital Field GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
The Intensity of Light
The intensity of the light is simply how bright it is and how much it illuminates your subject. This illumination decreases over distance as the light grows weaker. This holds true for all light sources, and it is the reason that the little pop up flash on the camera can’t light up something far away.
There is a rule in photography that you can calculate how much the light decreases in illumination as the distance between the light and the subject changes. This Inverse Square Law states that the illumination on a subject is inversely proportional to the square of the distance from the light source. Now, I am not a huge math fan, so let me break that down into something that can be easily understood. If you double the distance of the light from the subject—say, instead of four feet, it is 8 feet—the amount of light reaching the subject is a quarter of its original strength, not half. That means that to get the same exposure, you need four times the amount of light to reach the sensor. This can be achieved by using a longer shutter speed, a wider aperture, or by adding more light.
As shown in Figure 5.9, the intensity of the light can be changed by simply moving it closer to, or farther away from, the subject. Little changes can make a big difference, especially when you use smaller lights that are not quite as bright as others.
5.9 Here’s a set-up shot with ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.