generate 2d barcode vb.net 2: Understanding Exposure in Software

Draw QR Code in Software 2: Understanding Exposure

CHAPTER 2: Understanding Exposure
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does it choose After all, there are a lot of shutter speed/aperture pairs that will work To take the same properly exposed picture at ISO 100, any of these combinations should be exactly the same:
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Usually, the camera uses the following logic: The photographer wants to take a picture using the fastest available shutter speed to minimize camera shake and motion blur from objects moving inside the picture Though there are some exceptions, most cameras tend to choose the combination that allows for the highest available shutter speed, limited only by how small they can make the aperture given the current lighting conditions and ISO setting This isn t always what you want your camera to do, though, and in fact you might sometimes want to choose a slower shutter speed, overexpose the image, underexpose it, or perhaps base the exposure on a completely different part of the picture That s why you might want to investigate your camera and look for controls that let you tweak the shutter speed and aperture
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Adjusting Exposure Manually
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The most basic manual exposure control you can exert over your camera involves setting both the aperture and shutter speed Some digital cameras allow you to set these controls as if you
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The Truth About Shutters
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Though I talk quite a lot about shutter speed in this book, the reality is that few digital cameras have a real shutter in the sense that 35mm cameras have shutters The 35mm cameras usually have a physical barrier that blocks light from entering the chamber where the film is stored This mechanism the shutter blade moves lightning fast, able to deliver shutter speeds as fast as 1/8000 of a second That s fast Digital cameras, in comparison, often don t have real, physical shutters You can verify this yourself with a simple experiment: When you press the shutter release on a 35mm camera, you can hear the quick, metallic click of the shutter blade opening and closing A digital camera may not make any noise at all Or it might make an obviously fake click sound through the camera s speaker (Kodak and Sony cameras tend do this) It can, in fact, be quite difficult to discern whether a picture has been taken at all until you get used to the way digital cameras work When I had my first digital camera, I actually had to look at the LCD display on the back of the camera to see if the picture was captured, or if for some mysterious reason the camera was still waiting to grab the shot So if there s no shutter blade, how is the picture actually taken Often, the CCD is simply turned on long enough to expose the picture Since the CCD is an electronic component that acts as the camera s film, it can be actuated electronically for whatever exposure time is needed In addition, the camera s aperture may close completely to keep light from reaching the CCD prolonged exposure to sunlight can damage this sensitive part of the camera But the aperture needn t spring open and closed as quickly as the shutter blade in a 35mm camera, so the sound it makes isn t as dramatic You ll hardly notice it at all
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CHAPTER 2: Understanding Exposure
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had a fully automatic 35mm SLR There are two kinds of cameras you may run into with this capability:
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I Point and shoot Most point and shoot digicams that include manual settings for
aperture and shutter speed require you to use the LCD display to make onscreen menu changes The Epson PhotoPC 3000Z, for instance, uses a pair of buttons on the right side of the LCD display to adjust shutter speed, and another set of buttons on the bottom of the screen to change the aperture settings (as shown here) It isn t hard to do, but you need to remember first to set the camera to its Manual Exposure mode, then remember which buttons do what for fine-tuning exposure
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