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Digital photography All-in-one desk reference 3rd edition - Busch D.

Busch D. Digital photography All-in-one desk reference 3rd edition - Wiley publishing, 2006. - 755 p.
ISBN: 0-470-03743-1
Download (direct link): digitalphotographyallinone2006.pdf
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? Lens: The lens is the eye of your digital camera. Look for the following in your lens:
• You’ll want good-quality optics that focus a sharp image on your camera’s solid-state sensor. The best way to gauge the quality of the lens is to take a test photo or two. A vendor’s reputation or lab tests in magazines are other ways to evaluate a lens.
• The lens also needs enough light-gathering power to let you shoot in reduced light levels. A camera’s light-gathering capabilities are measured in something called f-stops, and I explain this in more detail in Book II, Chapter 1.
• The magnification power of the lens (how large or small an image appears to be from a particular shooting position) is another factor.
A digital camera’s lens magnification can usually be varied by zooming in and out to make the image larger or smaller.
• A related factor, the zoom range, is another key characteristic to look at. Where magnification tells you only how large or small the image can be made to appear, the zoom range tells you the difference between the two. As I mention under the discussion of general camera categories, some lenses have only a small zoom range, say 2:1, whereas others have a longer range, up to 12:1 or more (which means the image size can be varied up to 12X).
What’s the difference between magnification and zoom range? Magnification deals purely with how large or small an image appears to be. For example, one lens may extend from a 28mm (35mm equivalent) to 85mm (35mm equivalent) magnifications, a 3:1 zoom range. Another lens might go from 35 mm to 105mm (both 35 mm equivalents) and also qualify as a 3:1 zoom range optic. However, the second lens would provide more relative magnification.
? Storage: The kind and amount of removable storage is another key feature. The more storage space you have for photos, the more pictures you can take before “reloading” your digital camera. Most cameras use CompactFlash, Secure Digital, or other electronic “film” media. You can find more on this topic in Book II, Chapter 1.
Checking for Key Camera Features 31
? Exposure controls: Except for the least expensive models, all digital Book I
cameras include automatic exposure controls that adjust the amount of Chapter 2
light reaching the sensor based on the lighting conditions of your subject. If the illumination is low, an autoexposure system uses a wider lens S
f-stop or exposes the sensor for a longer period of time. If there is a lot of n'
light, the exposure system reduces the amount of light reaching the î
sensor. Cameras with more versatile automatic exposure controls let you q
specify what type of exposure to use. p
For example, when shooting action, it’s often preferable to use the short- Ď
est shutter speed possible to freeze the motion and to adjust the size of the lens opening instead. Conversely, if you want a lot of your image to be in sharp focus (say, objects very close to the camera and very far are both important), you may be able to choose an exposure mode that favors maximum depth of field. You probably want a digital camera that can handle several different exposure modes and lets you set exposure yourself. I explain more about these modes in Book II, Chapter 1.
? Focus controls: Most digital cameras also have an automated system for sharply focusing your images. Some are more versatile than others, and many cameras also let you focus manually to ensure that the subject matter you want to emphasize is the sharpest.
? Viewfinders: Digital cameras generally have four ways to let you preview and compose your images prior to exposure. The color LCD panel on the back of the camera shows you the same image that the sensor is capturing. The LCD is often hard to view in bright light, so digital cameras also may have optical viewfinders that let you see a nonelectronic version of the frame. More-advanced cameras might include a second LCD (EVF) in the camera, where it is shielded from the glare of the surrounding light.
Single lens reflexes (SLRs) let you see an optical version of the picture through the same lens used to take the photo. I explain more about your viewfinder options in Book II, Chapter 1.
? Other equipment, other features: Finally, as you choose your digital photography gear, think about accessories, such as tripods, filters, add-on lenses, external electronic flash units, scanners, printers, and additional stuff. Even the storage media you use to archive your photos, such as CDs or DVDs, can all be important.
I reveal the mysteries of these extra pieces of equipment in various parts of Book II. This overview has given you enough to think about.
32 Book I: Digital Photography Overview
Chapter 3: Acquiring Your Digital Pictures
In This Chapter
^ Transferring from your camera to your computer ^ Scanning images
^ Getting photos online or on Photo CD from a photo lab
^ow do you acquire digital photos? The quick answer is, “With a digital camera!” However, the digital photography process involves more than simply snapping a picture. Indeed, you can use other ways of acquiring a digital picture that don’t even involve a digital camera. Scanners, for example, can convert any printed image into a digital image. Some scanners, such as those with slide scanning attachments or dedicated slide scanners, can even capture color transparencies or negatives.
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