TAILIEUCHUNG - Complete Guide to the Nikon D200- P2

Complete Guide to the Nikon D200- P2: As with all my books, a full draft was reviewed by volunteers to weed out unclear language and misstatements. This book is better because of them. | In a compact camera such as this Coolpix light the green arrows goes separately to the sensor blue line and to your eye looking through a separate viewfinder bottom set of green arrows . Digital point-and-shoot cameras often use this same technique though most also show exactly what the digital imaging sensor is seeing by displaying it on an LCD as a live preview of the eventual image. A few now only have the LCD preview and skip an optical viewfinder entirely. The only problems with LCD preview are it slows down the image capture the camera has to switch from image preview to image capture which isn t as simple as it seems the color LCD is difficult to see in bright light the user tends to move the camera away from their body in order to see the LCD and thus compromises stability and the color LCD doesn t have a great deal of detail in it making it difficult to verify focus and even composition with really wide angle lenses. So let s look more closely at the SLR design The mirror and prism make it so that virtually all of the light collected by the lens makes it to your Film SLR users may sense slightly less light in the D200 viewfinder than they re used to. The primary culprit is that the actual frame area of the D200 is smaller than film. A smaller frame area means less total light gets through though the same amount gets through for any given spot it s a bit of an optical illusion that it seems dimmer . Think of the lens as part of a water pipe and light as water moving at a constant speed. If you make the pipe smaller you ll get less overall water. That s what s happening with the light you see in the viewfinder which is after all moving at a constant speed . Thom Hogan s Complete Guide to the Nikon D200 Page 31 The prism is necessary in order to flip the perceived image into the proper orientation lenses reverse up for down and left for right and we ve got a mirror in the path which flips one axis but not the other . The prism has mirrored .

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