how to generate barcode in vb.net 2010 1: Getting the Right Gear in Software

Generation Code 128 Code Set C in Software 1: Getting the Right Gear

CHAPTER 1: Getting the Right Gear
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If you want to use your LCD monitor in bright light, whether it s to frame a shot or review photos you ve already taken, attaching an LCD hood to the camera makes seeing the picture easier. The hood acts like a window awning, reducing the amount of light that hits the monitor. Shown here is one such device, sold by Hoodman (www.hoodmanusa.com). This particular hood, which sells for $50, comes with a detachable eyepiece that magnifies the display as well as a clear monitor shield that protects the display from scratches. Simpler shades without the eyepiece and shield sell for about $20.
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Filter and Converter Compatibility
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As you expand your photography knowledge, you may want to take advantage of creative filters, such as the warming and polarizing filters explored in 8. In addition, you may want to extend your camera s field of vision by attaching wide-angle, fisheye, or telephoto converters. These converters give you some of the lens flexibility that you enjoy with SLR cameras. Until recently, few filters or converters were available in sizes to fit digital camera lenses. But now that digital has caught on, manufacturers have begun to address this need. Figure 1.3 shows an assortment of filters from two major players in the filter market, Tiffen (www.tiffen.com) and Cokin (www.cokin.com). To attach most filters and converter lenses, you simply screw them onto the end of your camera s lens barrel. Of course, your lens barrel must have a threaded ring that accepts such add-ons. Many digital cameras don t offer threaded lens barrels, unfortunately. You may be able to buy an adapter that slips over the lens, giving you the threaded-ring functionality. Adapters aren t FIGURE 1.3 Accessory filters expand your creative options. available for all cameras, though, and they can be expensive. In some cases, you can t use third-party adapters so you have to buy the manufacturer s proprietary (and more costly) products.
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Cokin offers another filter alternative, shown in the middle of Figure 1.3. First you attach a filter holder to the bottom of the camera, screwing it into the tripod mount. Then you slip the filter into slots on the holder s two vertical arms. This solution can work great for some cameras, but make sure that the holder works with your lens barrel size and tripod-mount position before you buy.
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Be careful to remove filters and converter lenses before you power down the camera! If you don t, the filter or converter can crack the lens housing when the lens barrel retracts into the camera body.
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Most lens filters reduce the amount of light that enters the camera lens. To let photographers know how much light reduction to expect, manufacturers provide a guide number, known as filter factor, for every filter. Filter factors are stated in X numbers 1X, 2X, 4X, and so on. The number indicates how many times more light you need to produce the same exposure you would get without the filter. A factor of 1X means that no light reduction occurs; 2X means that you need twice as much light; 4X means that you need four times as much light. When cameras required photographers to set exposure manually, filter factors were vital. With most autoexposure cameras, the camera makes the necessary adjustments for you. However, this automatic adjustment occurs only on autoexposure cameras that offer through-the-lens (TTL) light metering. With TTL metering, the autoexposure mechanism analyzes the light that s actually coming through the lens. Some inexpensive autoexposure cameras take the light reading from a window that s separate from the lens, which means that the camera won t know when you attach a light-reducing filter. If you re using this type of camera, you can ramp up exposure by using the EV (exposure value) compensation control, discussed in the next chapter. (Don t worry; the control sounds complicated, but it isn t.) You can preview and review your shots in the camera monitor to check exposure.
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