Digital SLR Photography All-in-One For Dummies. Robert Correll
Чтение книги онлайн.
Читать онлайн книгу Digital SLR Photography All-in-One For Dummies - Robert Correll страница 7
Название: Digital SLR Photography All-in-One For Dummies
Автор: Robert Correll
Издательство: John Wiley & Sons Limited
Жанр: Зарубежная образовательная литература
isbn: 9781119291411
isbn:
Eye-Fi SD cards enable your camera to wirelessly transfer photos and movies to a phone, computer, tablet, or other mobile device. You must install additional software or apps for everything to work.
Flucard is a card unique to Pentax cameras. Similar to Eye-Fi, these SD cards offer wireless connectivity between your camera and smartphone or computer. Unlike Eye-Fi, however, you can use your smartphone to control the camera during remote Live View shooting with a Flucard and the proper app installed.
If you prefer to look at other options, there are a handful of other Wi-Fi SD cards available. Toshiba FlashAir and Transcend Wi-Fi are two examples.
❯❯ CF (Compact Flash) cards are an older memory card design, larger than SD cards. Despite this, they perform well and are often used in high-end cameras.
CFast cards, also known as CompactFast, are a newer, high-performance CF card variant with much faster read and write speeds. They are meant to support 4K video recording.
❯❯ Memory Stick cards were created by Sony, and are used in its cameras. There are different versions of Memory Stick media. Variants currently in use are Memory Stick PRO-HG Duo HX, Memory Stick PRO Duo, and Memory Stick PRO-HG Duo.
❯❯ XQD cards are another high-performance card used in newer Nikon cameras. They are intended to support high-speed still photo and 4K video recording.
Viewfinder specs
Take a look at two specifications relating to viewfinders:
❯❯ Frame coverage: This specification, given as a percentage, identifies how much of the scene the viewfinder sees compared to the image sensor. Oddly enough, most dSLR viewfinders don’t show you everything. This can be a problem when you’re trying to frame a scene precisely, and why more expensive professional cameras feature 100 percent (see Figure 1-17) or near-total coverage.
Now, despite the fact that it can be a nuisance, don’t obsess over having less than 100 percent coverage. You can still frame great shots. With experience, you’ll be able to account for the differences between your viewfinder and image sensor and frame your shots accordingly. For example, I have learned to place people’s heads a bit closer to the top edge of the viewfinder than appears necessary on many of my dSLRs. You can also crop photos in-camera or use software to achieve the perfect composition.
❯❯ Magnification: Most digital SLRs shrink the scene slightly in the viewfinder compared to what you see with your unaided eye. Expressed as a multiplier, anything under 1.0x means the view is reduced. If it’s over 1.0x, the view is magnified. Most cameras have magnification factors between .70x and .95x, with an exceptional few at or over 1.0x.
FIGURE 1-17: This camera has a nice, large viewfinder with 100 percent coverage.
Image stabilization
Image stabilization is important when shutter speeds are slow and you are supporting the camera by hand. Camera movement robs you of a sharp photo. All new digital SLRs from the major manufacturers steady the image using one of two different approaches:
❯❯ Lens: The image is stabilized in the lens, not in the camera body. Current lens-based stabilization systems are named differently, depending on the brand of camera. Canon calls its approach Image Stabilization (IS). Nikon uses the term Vibration Reduction (VR; see Figure 1-18). In both cases, the lens has a floating optical element that, when turned on, is gyroscopically stabilized. Subject to some limits, the IS/VR unit in the lens moves in opposition to camera movement. This keeps the image focused on the image sensor rather than jumping around.
Th advantage to lens-based stability systems is that everything benefits from stabilization: the autofocus system, the image sensor, the metering sensor, and what you see through the viewfinder or on the back monitor.
The main downside to lens-based image stabilization is that not all lenses have the feature. In addition, you have to keep buying new lenses to benefit from improvements and updates to the technoleogy.
❯❯ Sensor: This type of image stabilization occurs in the camera body. The camera adjusts the position of the image sensor in opposition to camera movement, thereby enabling you to capture a clear photo. Sony calls its technology SteadyShot (see Figure 1-19) while Pentax refers to its system as Sensor-shift Shake Reduction. Olympus features 3- or 5-Axis In-Body Image Stabilization; newer Sony’s a7-series full-frame mirrorless models are equipped with 5-axis image stabilization as well.
The main advantage to body-based stability systems is that the sensor, and therefore the image, is stabilized no matter what lens is attached to the camera. The most expensive long-range super-telephoto lens in the world and the cheapest plastic lens will both benefit from in-camera stabilization. As you upgrade camera bodies, you get the latest and greatest implementation of image stabilization for all your older lenses.
FIGURE 1-18: Nikon’s lens-based image stabilization technology is called VR.
FIGURE 1-19: This camera features in-body image stabilization, complete with an on/off switch.
Following Recent dSLR Developments
Digital SLRs continue to evolve. That is truly fantastic news, because photographers benefit from new capabilities and technology. Here are some recent dSLR developments and trends:
❯❯ Wi-Fi/NFC: After lagging behind for many years, built-in Wi-Fi/NFC (near-field communication) features are becoming more prevalent in new dSLRs. You can connect your camera to a smartphone (see Figure 1-20), tablet, computer, printer, network computer, or the Internet to view, print, or transfer photos. You can often control the camera remotely using the same connection and the proper app.
❯❯ Touchscreens: Taking a cue from the popularity of smartphones and tablets, some new digital SLRs feature touchscreen monitors. You can drag, swipe, and tap through menus, photos (see Figure 1-21), and even use the touchscreen to focus and snap the shutter.
❯❯ In-camera processing: Look for cameras to have even more processing options and filters.
❯❯ Higher ISO speeds: Maximum ISO speeds continue to rise. Entry-level consumer cameras now have maximum ISOs in the range of 12800, while more advanced dSLRs can have astronomically high ISOs. Higher ISO speeds make shooting inside and in other low-light conditions easier. They also enable you to use less-capable lenses with smaller maximum apertures in a wider variety of conditions.
❯❯ Higher pixel counts: Pixel counts also continue to rise. New consumer-level dSLRs have more pixels than professional models from years past. This means that you can take photos and make poster-sized prints without losing quality. You can also crop photos more without losing too much resolution.
❯❯ СКАЧАТЬ