By David Helvarg, Jim Toomey
The oceans, and the demanding situations they face, are so giant that it's effortless to consider powerless to guard them. 50 how one can shop the sea, written via veteran environmental journalist David Helvarg, makes a speciality of useful, easily-implemented activities every body can take to guard and preserve this very important source. Well-researched, own, and occasionally whimsical, the e-book addresses day-by-day offerings that impact the ocean's healthiness: what fish may still and shouldn't be eaten; how and the place to holiday; typhoon drains and driveway run-off; retaining neighborhood water tables; right diving, browsing, and tide pool etiquette; and helping neighborhood marine schooling. Helvarg additionally seems at what might be performed to stir the waters of possible daunting matters corresponding to poisonous pollutant runoff; conserving wetlands and sanctuaries; holding oil rigs off shore; saving reef environments; and replenishing fish reserves.
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Additional resources for 50 Ways to Save the Ocean
Understanding exposure is the subject of the next section. indd 12 7/26/11 12:22 AM Chapter 1: Nature and Digital Photography 13 Understanding exposure To capture a photograph, you need four things: a subject you want to photograph, a camera, light, and someone to press the shutter button (that would be you, dear reader). Your subject reflects light and casts a shadow. When you press the shutter button, your camera records everything in the frame and renders an image. If you just point the camera and shoot without visualizing the end result, you still end up with a picture.
When you photograph a scene with a telephoto lens, you end up with a shallower depth of field than you would when photographing with a lens with a shorter focal length. Remember this when you photograph subjects like birds and animals (see Figure 1-6). indd 20 7/26/11 12:22 AM Chapter 1: Nature and Digital Photography 21 Another way to control your depth of field is to get closer to your subject. Get close to your subject with a telephoto lens, and you compress the distance between objects in front of and behind your subject, which brings your subject into clear focus.
He knows which settings to use, which lens to use, how to compose the picture, and so on. A photograph captured by a master photographer is a visual feast, one which viewers spend time looking at. If you were to compare an image of Colorado’s Maroon Bells captured by David Muench, for example, to a snapshot of the same scene captured by a vacationer with a pointand-shoot camera. Many people will say the difference is the fact that David uses expensive equipment. Yes, good equipment will give a photographer a leg up.