Pentax K-5 DSLR Lab Test and more!

Pentax K-5 DSLR Lab Test and more!	View this email online

	February 24, 2011 Breaking news from America's top photo magazines From the Forums: What is the best way to recover images from a corrupted card? Our readers share their thoughts. Join and Contribute!

	Lab Test: Pentax K-5 DSLR This rugged new DSLR is tough to beat. The Best Services for Printing Your Photo Books We sampled 10 of the most popular companies, see which ones provided the best overall experience. How To: Optimize a Landscape in Photoshop Five tips to makes your scenics great. Gallery: I, Photographer, Museum Shooter Robert Hasimoto documents the art institute of Chicago. Photo of the Day Think your photos have what it takes to be named Photo of the Day? Then upload your best shots to our Flickr page. See the whole gallery here TECH SUPPORT Why Midrange Apertures are Sharper Judging by reader mail, there’s still some confusion out there about aperture selection and image sharpness. While smaller apertures (e.g., f/22) produce deeper slices of sharpness from front to back, the central focused-upon subject of your picture will usually always be sharper when captured by an intermediate aperture (e.g., f/8). Why? Because of diffraction. When light rays strike an object, such as the diaphragm blades of a lens, the rays tend to bend or diffract, an action that adversely affects sharpness. When you set your smallest aperture, a greater percentage of all the light rays transmitted through the lens are diffracted, resulting in a subject that’s relatively fuzzy compared to what’s possible with the less-diffracted rays typical of wider apertures. And why do the widest apertures (e.g., f/2.8) also produce a relatively fuzzy subject? That’s a subject for another “Tech Support.”

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