barcode dll for vb net 5: Capturing Close-ups in Software

Drawer Code 128A in Software 5: Capturing Close-ups

CHAPTER 5: Capturing Close-ups
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Another type of macro flash, known as a ring flash, has a circular design that puts an even dose of light all around the camera lens. Figure 5.10 shows an example; also from Canon, this flash sells for about $450. A ring flash is especially useful for shooting jewelry and other very small objects. Note that your camera must have either a hot shoe or flash socket to FIGURE 5.10 This ring flash mounts over the camera lens and fires automatically when the camera s use most macro flash units. You own flash fires. also may need an adapter to mount the macro unit onto your camera lens, so check your camera manual to find out whether the manufacturer offers adapters. If not, the flash manufacturer may sell them for your model.
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Don t despair if your camera offers neither a hot shoe nor an external flash socket;
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several manufacturers offer slave flash units designed for macro photography with digital cameras. As explained in 1, a slave flash is triggered by your camera s built-in flash, so no hot shoe or socket is needed.
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Exploring Macro Photography
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As mentioned earlier in this chapter, many digital cameras offer a macro focusing mode. But whether or not you re really getting macro capabilities depends on the camera. Traditionally, the term macro was reserved for a lens that could render an image at life size on a 35mm negative. Camera manufacturers are a little sloppy about using the term, though, so your lens may not actually fit that precise definition. Don t give this issue a lot of thought, however. Because there is no such thing as a standard sized negative with digital photography, the whole macro yardstick er, millimeter stick is sort of meaningless. All that really matters is whether the minimum focusing distance of your camera allows you to get as close to your subject as you want to be. Unless you have a need for extremely detailed close-ups of small objects, the macro mode on your digital camera will likely serve you just fine. Remember that if you re working with a high-resolution digital camera, you can always enlarge the printed image to reveal as much detail as you like.
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If you own a low-resolution camera or want to get closer than your lens allows, you have a number of options. Serious professionals use super-macro lenses or attach bellows or extension tubes to their lenses to gain more close-focusing ability. But these solutions are expensive and aren t even possible for most point-and-shoot style cameras. For those photographers just getting started in close-up photography, a more practical and less costly option is to buy a set of close-up lenses, sometimes called diopter lenses. You can see a pair of screw-on close-up lenses from Tiffen in the foreground of Figure 5.11. (More about the other objects in the figure in a moment.) This set sells for about $60. (You may need to purchase an additional adapter to mount the close-up lens onto FIGURE 5.11 You can expand your close-up opportunities by using screw-on close-up lenses or just your camera lens.) shooting through a magnifying glass or The power of a close-up lens known photographer s loupe. as its diopter power is assigned a numerical rating: +1, +2, and so on, just like the reading glasses you can buy in your local pharmacy. The higher the number, the greater the lens power, and the closer you can focus on your subject. You can stack several close-up lenses on top of each other to achieve their combined power. Page 25 of the color insert presents some examples that illustrate the relative strength of a diopter power of +7, +10, and +17. To get the +17 power, I stacked the +7 and +10 lenses. Figure 5.12 shows the difference Camera only +17 close-up lens between an image taken with the camera s macro mode only and with the +17 stack. However and this is a crucial however the impact on your photo depends on two factors: the focal length of the camera lens and the camera-to-subject distance. For the images shown in the color insert, the camera focal length was the FIGURE 5.12 Stacking a +10 and +7 close-up lens, for a total equivalent of about 60mm on diopter power of +17, enabled me to get a a 35mm film camera, and the
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