The Future of Cameras. Plus, Photographing the Human Eye and More!

The Future of Cameras. Plus, Photographing the Human Eye and More!	View this email online

	October 7, 2010 Breaking news from America's top photo magazines From the Forums: How old do you think is too old for a digital SLR? Our readers share their thoughts. Join and Contribute!

	Future Tech: A look at Next Gen Cameras Edible cameras. Focus that changes after you shoot. What's really in store for photo technology? How To: Photograph Your Own Eye Create a startling close-up with a ring flash. Why Sensor Size Changes the Angle of View Learn how to understand the crop factor. Gallery: Canon Powershot SD4500 Sample Shots We spent some time with Canon's new superzoom compact. 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 Crop Now or crop later? Q. Generally speaking, which would give better results with distant subjects: an 18–200mm zoom at 200mm without cropping, or an 18–55mm zoom at 55mm with cropping afterwards? A. You’d have to blow up the image from a 55mm lens to16x20 inches to get about the same subject magnification as an 8x10 made from a 200mm lens. It’s technically feasible that, given a very good short lens and not-so-good long, they would provide about equal optical quality under these conditions. But it’s immaterial—the longer lens would still give you a much better image. Why? Given that you’d be enlarging the image from the shorter lens nearly twice as much as that of the longer lens, it would end up with half the dots-per-inch resolution. This would be like an image from a 12MP sensor compared to that of a 3MP sensor. (Halve the dots per inch in an image, and you get 1/4 of the dots overall.) Bottom line: If you want to magnify the image, do it in the camera.

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