Autofocus systems have become very sophisticated over the last few years. In the third of our Nobody Does It Better series, Angela Nicholson looks at which camera manufacturer makes it easiest to get moving subjects sharp. Let’s start with a bit of background… Most of the light that exits the lens on a single lens reflex (SLR) camera is reflected up by the mirror into the viewfinder but a small amount passes through and onto a secondary mirror which reflects it towards the dedicated autofocus sensor. A small lens assembly splits the light so that it forms two images on the line or cross type sensors on the autofocus (AF) sensor. If the two images align, the lens is focused on the subject, but if their alignment is not correct and the images are out of phase, the camera knows which direction to move the lens focusing group and by how much. This process is known as phase detection focusing. This method of focusing has served us well for years, it’s very fast and accurate, but it’s not without its issues. Firstly, there’s a limit to how much light can go through the main mirror, which restricts the number […]
Click here to view original web page at www.amateurphotographer.co.uk
More Stories
The best Canon DSLR you can buy in 2022
How to Choose Your First Digital Camera
Photographer’s guide to buying a smartphone