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Every consumer-grade camera saves the pictures it takes onto some type of removable storage media Think of it as your digital film Probably the most common removable storage media used in modern digital cameras (and probably your best choice) is the Secure Digital (SD) card (Figure 1438) About the size of a Wheat Thin (roughly Cross Check an inch square), you can find these Flash Media tiny cards with capacities ranging You learned all about the many types of flash media and micro drives from 64 MB to more than 1 GB back in 10, Removable Media, so go there now and answer They are among the fastest of the these questions What s the difference between a thumb drive and an various media types at transferring SD card Can you make a bootable flash-media drive data to and from a PC, and they re quite sturdy
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These days, almost all digital cameras plug directly into a USB port (Figure 1439) Another common option, though, is to connect only the camera s storage media to the computer, using one of the many digital media readers available You can find readers designed specifically for SD cards, as well as other types Plenty of readers can handle multiple media formats Many computers come with a decent built-in digital media reader (Figure 1440)
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Figure 1438
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Figure 1439
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As with scanners, you should consider the amount of information a particular model of camera can capture, which in the digital camera world is expressed as some number of megapixels Instead of light-sensitive film, digital cameras have one CCD (charged coupled device) or CMOS (complementary metal-oxide semiconductor) sensor covered with photosensiDigital media reader built into computer tive pixels (called photosites) to capture the image; the more pixels on the sensor, the higher the resolution of the images it captures Not so long ago, a 1-megapixel digital camera was the bleeding edge of digital photographic technology, but now you can find cameras with ten times that resolution for a few hundred dollars As a basis of reference, a 2-megapixel camera will produce snapshot-sized (4 6 inch) pictures with print photograph quality, whereas a 5-megapixel unit can produce a high-quality 8 10-inch print Another feature of most digital cameras is the ability to zoom in on your subject The way you ideally want to do this is the way film cameras do it, using the camera s optics that s the lens Most cameras above the basic level have some optical zoom meaning the zoom is physically built into the lens of the camera, but almost all models include multiple levels of digital zoom , accomplished by some very clever software in the camera Choose your camera based on optical zoom 3 at a minimum, or better if you can afford it Digital zoom is useless
Figure 1440
Form Factor
As was the case with film cameras, size matters on digital cameras Digital cameras come in several form factors They range from tiny, ultra compact models that readily fit in a shirt pocket to monster cameras with huge lenses Although it s not universally true, the bigger the camera the more features and sensors it can have Thus, bigger is usually better in terms of quality In shape, they come in a rectangular package, in which the lens retracts into the body, or as an SLR-type, with a lens that sticks out of the body Figure 1441 shows both styles
Figure 1441
Typical digital cameras
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
Web Cameras
PC cameras, often called webcams because their most common use is for Internet video communication, are fairly new to the world of common I/O devices Too many people run out and buy the cheapest one, not appreciating the vast difference between a discount webcam and more expensive models; nor do they take the time to configure the webcam properly Let s consider some of the features you should look for when buying webcams and some of the problems you can run into when using them The biggest issue with webcams is the image quality Webcams measure their resolution in pixels You can find webcams with resolutions of as few as 100,000 pixels, and webcams with millions of pixels Most people who use webcams agree that 13 million pixels (megapixels) is pretty much the highest resolution quality you can use before your video becomes so large it will bog down even a broadband connection The next issue with webcams is the frame rate; that is, the number of times the camera takes your picture each second Higher frame rates make for smoother video; 30 frames per second is considered the best A good camera with a high megapixel resolution and fast frame rate will provide you with Figure 1442 excellent video conferencing capabilities Figure 1442 shows the author using his headset to chat via webcam using Skype software Most people who use online video will also want a microphone Many cameras come with microphones, or you can use your own Those who do a lot of video chatting may prefer to get a camera without a microphone, and then buy a good quality headset with which to speak and listen Many cameras now have the ability to track you when you move, to keep your face in the picture a very handy feature for fidgety folks using video conferencing! This interesting technology recognizes a human face with little or no training and rotates its position to keep your face in the picture Some companies even add funny extras which, while not very productive, are good for a laugh (Figure 1443)
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