Optical vs. Digital Zoom: What You Need to Know

calista.chandler — Wed, 25 Jun 2008 21:24:22 GMT

One of the most important things to understand when shopping for a digital point-and-shoot camera is the difference between optical and digital zoom. Some camera manufacturers label their cameras with the total zoom (digital x optical), but the two should not be combined because they are very different in terms of the kind of image quality they produce.

Optical Zoom – Pros

Optical zoom is achieved by moving the glass elements within the lens to enlarge the image. This is the same as the zoom on a film camera, or a digital SLR (single-lens-reflex camera) with interchangeable lenses. Image quality is not lost with optical zoom, so the higher the optical zoom rating your camera has, the farther away from your subject you can be and still capture a high quality image.

Digital Zoom – Cons

Digital zoom, on the other hand, does negatively affect the quality of your images. In reality, digital zoom isn’t zoom at all, but a simulation. When you use digital zoom your camera is enlarging a portion of your image to achieve an effect similar to optical zoom. It crops the area of the image that you’re not ‘zooming in’ on, and then digitally enlarges what remains to fit your screen. This results in lower quality image, and is exactly the same as what can be achieved in any photo editing software.

Avoid Digital Zoom Pitfalls

Most digital point and shoot cameras come with some measure of digital zoom, but it’s important to note that not all cameras give you control over it. Look for a camera that lets you disable the digital zoom, or at least lets you know when you are using it. If you are going to crop your images in editing software anyway, digital zoom might be a useful timesaving tool, but keep in mind that unlike full quality images that you crop on your computer, once you shoot an image with digital zoom you are stuck with it. There is no going back to the higher quality version.

The bottom line is that it is safe to ignore digital zoom when considering cameras with various zoom configurations. Optical zoom is what really matters, so investing in a camera with a higher optical zoom rating will give you higher quality images, and more versatility when you shoot.

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Optical vs. Digital Zoom: What You Need to Know