Chapter 5 Mastering Autofocus Options

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Single-Servo Autofocus (AF-S)

In this mode, also called AF-S, focus is set once and remains at that setting until the button is fully depressed, taking the picture, or until you release the shutter button with- out taking a shot. For non-action photography, this setting is usually your best choice, as it minimizes out-of-focus pictures (at the expense of spontaneity). The drawback here is that you might not be able to take a picture at all while the camera is seeking focus; you’re locked out until the autofocus mechanism is happy with the current setting. As described in Chapter 9, you can set AF-S mode to use either focus priority (the default) or release priority using CSM #a2.

When sharp focus is achieved, the selected focus point will flash red in the viewfinder, and the focus confirmation light at the lower left will flash green. If you’re using Matrix metering, the exposure will be locked at the same time. By keeping the shutter button depressed halfway, you’ll find you can reframe the image while retaining the focus (and exposure) that’s been set. You can also use the AE-L/AF-L button, as described in Chapter 9, if you’ve set that button to lock focus when pressed. Because of the small delay while the camera zeroes in on correct focus, you might experience slightly more shutter lag. This mode uses less battery power.

Continuous-Servo Autofocus (AF-C)

This mode, also known as AF-Cis the mode to use for sports and other fast-moving subjects. In this mode, once the shutter release is partially depressed, the camera sets the focus but continues to monitor the subject, so that if it moves or you move, the lens will be refocused to suit. Focus and exposure aren’t really locked until you press the shut- ter release down all the way to take the picture. You’ll find that AF-C produces the least amount of shutter lag of any autofocus mode when set to release priority: press the but- ton and the camera fires. It also uses the most battery power, because the autofocus sys- tem operates as long as the shutter release button is partially depressed.

Continuous-servo autofocus uses a technology called predictive tracking AF, which allows the D7000 to calculate the correct focus if the subject is moving toward or away from the camera at a constant rate. (Automatic autofocus, AF-A, described next, also uses predictive tracking when operating in AF-C mode.) It uses either the automatically selected AF point or the point you select manually to set focus. As described in Chapter 9, you can set AF-C mode to use release priority (the default), or focus priority using CSM #a1.

If you want to lock the focus point you’ve selected for a series of shots, rotate the focus selector lock lever up to the L position. You can also temporarily lock the focus point by partially depressing the shutter release, or pressing the AE-L/AF-L button (unless you’ve redefined this behavior to some other controls in the Custom Settings menu).

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Nikon D7000 manual Single-Servo Autofocus AF-S, Continuous-Servo Autofocus AF-C

D7000 specifications

The Nikon D7000 is a mid-range digital single-lens reflex (DSLR) camera that has garnered a reputation for its impressive blend of features and user-friendly design. Released in 2010, the D7000 marked a significant step forward for Nikon, appealing to both amateur photographers and enthusiasts seeking a robust and versatile camera.

At the heart of the D7000 is a 16.2-megapixel APS-C (DX) CMOS sensor that delivers sharp, high-resolution images with rich colors and stunning detail. Coupled with Nikon's EXPEED 2 image processing engine, the camera excels in low-light performance, allowing photographers to shoot at sensitivities ranging from ISO 100 to ISO 6400, expandable to ISO 25600. This flexibility empowers users to capture clean images even in challenging lighting situations.

The autofocus system of the D7000 is another highlight, featuring a 39-point AF system with nine cross-type sensors. This advanced system ensures fast and accurate focus, making it suitable for a variety of shooting scenarios, from portraits to fast-action sports photography. The camera also includes full HD video recording capabilities at 1080p, with options for frame rates of 24, 25, and 30 frames per second, providing videographers with quality and flexibility.

The D7000's build quality is robust, with a magnesium alloy body designed to withstand the rigors of regular use. It is weather-sealed to protect against dust and moisture, making it a reliable choice for outdoor shooting. The camera features a 3-inch LCD screen with a resolution of 921,000 dots, allowing for high-clarity image review and menu navigation. The 100% viewfinder coverage gives a true-to-life perspective when composing shots.

Additional features include in-camera HDR, multiple exposure capabilities, and a comprehensive set of scene modes that assist users in achieving the best results in various conditions. The D7000 is also equipped with dual memory card slots, supporting both SD and SDHC formats for ample storage and backup options.

With its combination of high-quality imaging, advanced autofocus, robust build, and versatile features, the Nikon D7000 stands out as a powerful tool for photographers looking to elevate their craft.