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The Panasonic Lumix DMC-G2 by Carol F. Roullard, Brian Matsumoto Ph.D

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Focusing

Our eye and brain automatically see the world as being in sharp focus. For those with normal eyesight, it is only when using a microscope, telescope, or binoculars do they need to focus. With these optical instruments, we improve the image’s definition by turning a wheel that moves a lens forward or backward toward our eye.

The same occurs with older SLR cameras—we looked through a view-finder and turned a focusing ring surrounding the lens to bring a blurred image into sharpness. Things have changed with the modern camera; focusing is automated and a motorized lens brings the image to focus at a push of a button. Even so, to exploit this automation fully, an understanding of what is going on is necessary to optimize camera settings for ...

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