![]() It sounds easy enough, right? But all of this (hopefully) happens in the fraction of a second. The AF sensor tells the lens to stop focusing when the object becomes focused.The lens elements are moved by the AF motor (in camera or in the lens).If it’s not in focus, it tells the AF motor to move the lens element(s) in the direction it ‘thinks’ will bring the scene into focus.The AF sensor determines if the scene appears in focus.In simple terms, the autofocus system in your camera works like this: I just wanted to show you what goes on inside the camera and now comes the fun part of explaining how it all works! My goal here is show the different types of Autofocus and how cameras focus so that you can use this knowledge to improve your photography. When you take a photo, the main mirror will snap up and let the light hit the main sensor. Mirrors (in a DSLR) are used to direct the light to the Autofocus (AF) sensor. Here is a diagram that shows where the light comes in to camera and where the sensors are (generally) located.Īs you can see, the light bounces around a lot to make sure the sensors do their job. I’ve moved from Nikon D70 to a D300 to D800e to a D850 – each step provided me with huge improvement in all areas.īut what we want to look at in this lesson is how the DSLR cameras of today use autofocus and how you can use this knowledge to improve your photography. Each new generation of DSLR cameras has a better sensor, better metering and better autofocus. This short history lesson is to let you know that the technology we use today is quite young, especially compared to film cameras. After the Maxxum came out, the other manufacturers followed and in 1991 Kodak introduced the first readily available Digital SLR based on a Nikon film camera. Lenses had been previously introduced that would autofocus, but they were bulky and never caught on. It was the first “auto everything” SLR as it would focus, expose and then wind the film all automatically, but still allowed for manual exposure settings and manual focus. It also had a lot of other features that we would recognize in our modern cameras. It was the first SLR to have autofocus built into the body and it changed everything. One of the top technological advances in photography happened in 1985 when the Minolta Maxxum 7000 was introduced.
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