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Depending on the distance of the subject from the camera, the lens has to be a certain distance from the film to form a clear image. In most modern cameras, autofocus is one of a suite of automatic features that work together to make picture-taking as easy as possible. Some cameras may have a combination of both types, depending on the price of the camera. In general, less expensive point-and-shoot cameras use an active system, while more expensive SLR (single-lens reflex) cameras with interchangeable lenses use the passive system. Looking for a Tripod to Steady your Images? Read Tripod Reviews and compare prices at Consumer Guide Products before you buy. The Polaroid camera used an ultra-high-frequency sound emitter. Then listened for the echo (see How Radar Works for details). The Polaroid Spectra and later SX-70 models computed the amount of time it took for the reflected ultrasonic sound wave to reach the camera and then adjusted the lens position accordingly.|Russia has more than 92,000 troops amassed around Ukraine’s borders and is preparing for an attack by the end of January or beginning of February, the head of Ukraine’s defense intelligence agency told Military Times. Such an attack would likely involve airstrikes, artillery and armor attacks followed by airborne assaults in the east, amphibious assaults in Odessa and Mariupul and a smaller incursion through neighboring Belarus, Ukraine Brig. Gen. Kyrylo Budanov told Military Times Saturday morning in an exclusive interview. Russia’s large-scale Zapad 21 military exercise earlier this year proved, for instance, that they can drop upwards of 3,500 airborne and special operations troops at once, he said. The attack Russia is preparing, said Budanov, would be far more devastating than anything before seen in the conflict that began in 2014 that has seen some 14,000 Ukrainians killed. The Ukraine military's assessment of a how a potential attack by Russia would play out shows the country ringed by Russian battalion tactical groups, or BTGs. Electronic cigarettes closely resemble the real thing. You're at your favorite restaurant, enjoying a meal. A diner at the next table is puffing on a cigarette, letting out a cloud of smoke. Because smoking isn't allowed in the restaurant, you're thinking about asking the smoker to put the cigarette out. But before you protest, consider this: Your neighbor may not be smoking at all. Electronic cigarettes, also known as smokeless cigarettes, e-cigarettes, or e-cigs, are an alternative method of consuming nicotine, the addictive chemical found in tobacco. Manufacturers often design e-cigarettes to look like regular cigarettes, but they contain no tobacco and don't require a match -- or any flame at all. There's no fire, no ash and no smoky smell. E-cigarettes do not contain all of the harmful chemicals associated with smoking tobacco cigarettes, such as carbon monoxide and tar. Manufacturers and satisfied customers say the e-cigarette is a healthier alternative to tobacco cigarettes, which cause millions of deaths every year. bbc espanol

















































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