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Mind you, there are no right or wrong choices here; the best shooting distance and focal length depend on the artistic goal you have in mind. Also note that when I speak of a zoom lens, I m talking about a true optical zoom lens not the so-called digital zoom found on most cameras. To find out why I say so-called, zoom to the next section.
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If your camera doesn t offer a zoom lens, see 1 for information about accessory telephoto lenses.
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When digital cameras first came to market, manufacturers believed that consumers would be less intimidated by the new technology if camera features were described using familiar film terminology. Thus, camera memory cards are often called digital film, and lens focal lengths are stated in terms of equivalent focal lengths on a 35mm film camera. I can deal with digital film though it makes no sense at all and the 35mm-equivalency thing is a logical, if complicated, way to deal with the lack of a standard image-sensor size in digital cameras. ( 1 explains how image-sensor size relates to focal length.) But one term that emerged from the digital-is-just-like-film camp is downright misleading. As you may have guessed from the headline to this section, I m speaking of digital zoom. A digital zoom works nothing like the zoom lens on a film camera referred to as an optical zoom in the digital-camera world. When you use a digital zoom, the camera simply enlarges and crops the image after you shoot it. The end result is the same as if you were to enlarge an image in your photo editor and then crop away the perimeter. The resulting photo will be of lower quality than it would be if you captured the same subject with an optical zoom, as illustrated by the images on Page 21 of the color insert. The quality loss occurs because the digital zoom function throws away some of your original image pixels to crop the image. In most cases, the camera then adds new pixels or, in imaging lingo, it resamples the photo to rebuild the remaining picture area at the original, full-frame size. Adding pixels to an existing photo is always destructive to image details. ( 9 explores the resampling issue in more detail.) Some cameras do not resample the image but instead simply save the picture file with the reduced pixel count. But as explored in 2 and illustrated on Page 3 of the color insert, this approach is no better than resampling if you want to print your pictures at a decent size you simply don t have enough pixels to produce a quality photo. In addition, angle of view and depth of field aren t affected as they are with optical zoom, because a digital zoom does not change lens focal length. Nor does digital zoom have an impact on exposure, distortion, or spatial relationships. (The preceding section offers more words of wisdom on these issues.) Again, a digital zoom really should be called in-camera cropping and enlarging because that s what this feature does. That s not to say that in-camera cropping and enlarging isn t sometimes useful if you re printing directly from a memory card, for example, and you don t need top-notch image quality. Just don t buy into the notion that a digital zoom is anything more than a convenience, no matter how the camera ads or sales reps try to convince you otherwise.
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Check your camera manual to find out how your camera s digital zoom function is triggered. In some cases, the camera shifts to digital zoom automatically when you reach the end of the optical zoom range. With other cameras, the digital zoom comes to life only if you press and hold the zoom lever for a few seconds after reaching the optical zoom limit. Some models enable you to turn off digital zoom capability altogether; I recommend you do so if your camera provides this control. You can always turn the function back on for those occasions when you want to take advantage of in-camera cropping and enlarging.
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