Giz Explains: Why Lenses Are the Real Key to Stunning Photos

When most of us talk digital cameras, we talk megapixels, ISO, image noise, shot-per-second speed and image processing. We're tech geeks. But really, none of that stuff matters as much as your camera's lens.

The lens is, after all, your camera's eyeball—the image sensor or film can only record what comes in through the lens. It's what defines the picture's perspective, clarity and way more.

Lenses are actually a really complicated thing to talk about—if your job was to steer photons through tunnels of stretched glass, people would call you complicated too—so we're gonna try to keep it to field basics, you should know to get around, rather than dive into the crazy physics and mathematical ratios and stuff.

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New Chips Poised to Revolutionize Photography, Film

For the first time, professional-grade single-lens reflex cameras are gaining the ability to record high-definition video. That capability, photographers say, has the potential to transform both still photography and moviemaking.

While compact digital cameras have had video-recording capabilities for years, the image quality provided by these cameras has been disappointing because of their small image sensors and comparatively poor, miniaturized optics. High-end video and movie cameras produce top-notch HD video and their interchangeable lenses give filmmakers the creative control they crave, but the cameras are big and expensive. Even the RED ONE, a super-high-definition movie camera that records digital video that's comparable in quality to that of film stock, rings up at about $17,000. That's a bargain compared to movie cameras, but it's still a lot of dough for most people.

By contrast, the 21-megapixel Canon 5D Mark II, which shoots 1080p HD video, will cost $2,700 (plus the cost of lenses) when it becomes available later this year. The 12-megapixel, highly rated Nikon D90, which records 720p HD video and is available now, costs even less: a mere $1,300 gets you the body plus a basic zoom lens.

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