TAILIEUCHUNG - Complete Guide to the Nikon D200- P13

Complete Guide to the Nikon D200- P13: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. | Depth of field in the 35mm film world is often calculated as follows _-_ Distance NearFocus -7 ------------- -------------------y L c. ._. Aperture__. n 11 I Distance I r I FocalLength II I I I 1000 J Distance FarFocus L L- Aperture _ 11 -I Distance I ------I FocalLength II L L I 1000 J JJ But conservative photographers also take into account the amount of magnification that the final image undergoes. An 8 x 10 print from a D200 comes from a smaller imaging area than a print from a 35mm film negative thus undergoes more magnification. Details that were small enough to pass as in focus to our eye at normal viewing distances may appear out of focus when magnified. I could present a long theoretical discourse and accompanying math regarding the differences between 35mm film and the D200 but that s a bit beyond the scope of this book. Instead I ll present my conclusion depth of field appears to me to be a bit less than a one stop difference for a D200 than 35mm film at least for the sized prints that you re likely to produce 11 x 14 or smaller . So if you re using depth of field or hyperfocal distance charts intended for 35mm film cameras with your D200 simply add a stop for a conservative approach. For example if your 35mm film chart says that the hyperfocal distance is 50 feet for a 50mm lens at f 2 which it should if it uses the conservative Zeiss circle of confusion value simply use f on the D200. Note The depth of field markings on most Nikkor lenses appear to be calculated using a circle of confusion of with a few older ones possibly using . Carl Zeiss suggested that the circle of confusion should be 1 1730 of the diagonal Thom Hogan s Complete Guide to the Nikon D200 Page 361 measurement of the frame which for 35mm would be . That s the value that I and many other professionals use for 35mm. For a D200 the Zeiss number would be technically but I round down . Since the penalty .

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