Thursday, 7 April 2011

New Gear: Nikon D5100 DSLR and more!

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April 7, 2011

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Gallery: Nikon D5100 Sample Images
We spent 24 hours shooting with Nikon's newest DSLR.


Nikon D5100 DSLR Has a Swiveling Screen, Full-Time Video AF
This new starter DSLR seems ready to rumble with Canon's T3i.



Photo Contest: Childhood
Enter your best representation of what it is to be kid for a chance to win some sweet gear!



New Gear: Lensbaby Composer Pro
A new metal body offers smoother swiveling and more accurate focusing.



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TECH SUPPORT

Macro Factor

Q. The February 2011 issue’s “10 Things You Should Know About Lenses” states that a 1X magnification gives you a tighter closeup than a 0.67X magnification. If that’s so, why does the article imply that a magnification of 1.5X is not a true macro lens? And what exactly is life-size magnification?

A. There are two common ways of expressing magnification—as a ratio or as a multiple—and perhaps we could have been clearer in distinguishing them. When a magnification is given as a ratio of 1:2, or 1:3, or 1:4, it’s the same as stating that the magnification is 1/2, or 1/3, or 1/4 life-size. Expressed as multiples, these would be 0.5X, 0.33X, or 0.25X, respectively. We stated that a magnification of 1:5 does not qualify as true macro in our book; this would be a 1/5 life size, or 0.2X, not 1.5X.

At life-size magnification (1:1 or 1X), the image of an object projected onto the sensor or film is the same size as the object itself. Example? A photograph of a 24x36mm U.S. postage stamp that filled the 24x36mm sensor of a full-frame DSLR would be at 1:1 magnification. At greater than life-size magnifications, the image projected by the lens onto the sensor exceeds the size of the object being photographed. Case in point: Canon’s 65mm f/2.8 MP-E Macro can focus at up to five times life size, which would be expressed 5X or 5:1..

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