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An autofocus (AF) optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication.
Jul 15, 2021 · Autofocus is a highly sophisticated and useful tool. Understanding which mode to use and how to choose and move an active AF Point will help you to be more selective and creative with your photography.
- How Camera Autofocus Works. The nice thing about digital cameras today is that they come with all kinds of sophisticated autofocus features. If back in the day one had to master both manual focus and autofocus features of their cameras to get images that were in focus, today, one can simply switch to the correct autofocus mode and let the camera do all the hard work.
- Autofocus Modes. Nowadays, most digital cameras are equipped with several different focus modes for various situations. It is one thing to photograph a still subject’s portrait, and another to photograph a running person or a bird in flight.
- AF-Area Modes. To make things more confusing, many digital cameras also have something called “AF-Area Mode”, which allows photographers to choose several options to use while operating in AF-S, AF-C, AF-A, and AF-F modes.
- Autofocus Scenarios and Examples. So far you have read a lot of technical information on each focus mode and AF-Area modes. Let’s now go through different scenarios and examples for you to fully understand and grasp the information above.
Your essential guide to Nikon autofocus. While post-production editing can sort out many issues, an out-of-focus image isn’t one of them. Sharp shots are essential for great photography, so here’s everything you need to know about autofocus on your Nikon DSLR or Z series camera.
In this article, you will learn about the two most common forms of autofocus, and find out how to determine which type of autofocus your camera uses. You will also learn some valuable tips about preventing the main causes of blurred pictures when using an autofocus camera.
Why are some cameras faster to focus than others? Dr Andy French explains the different approaches the computers inside cameras use to focus. https://www.fac...
- 18 min
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- Computerphile
Mar 8, 2017 · How Autofocus Works. Most modern cameras use passive autofocus instead of active autofocus. Rather than using a laser or infrared beam to measure the distance to the subject (active autofocus), passive autofocus uses a phase detection, contrast sensors, or often a mix of both. On a smartphone, the image sensor might double as the autofocus sensor.
