What is the difference between optical and digital zoom?
Optical zoom on a digital camera works the same way as the zoom on a regular 35mm camera — the lens physically moves in and out to bring the subject closer or move it farther away without sacrificing picture quality. These moving lenses allow a range in optical magnification that runs anywhere from 2.0x to 10.0x. The higher the optical zoom on a camera, the farther away you can be to take a photograph and still get a clear, close-up image. Digital zoom is a software simulation of optical zoom using no moving parts. Simply put, the camera crops the picture and enlarges it, filling in the extra pixels by guessing what the picture may look like in a process called interpolation. This results in a loss of quality and is not unlike cropping and enlarging an image with editing software on a computer. Instead of using the digital zoom on your digital camera, you can use editing software on your computer and have more control over cropping and enlarging the picture. Many new models of digital
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Most digital cameras have an optical zoom, which increases magnification via lens manipulation The image is changed before it hits the CCD so each pixel has unique information. Resolution stays the same when the image is enlarged optically, which means the picture is still crystal clear. The quality of the optics is important because it determines the final quality of the photo. A digital zoom is used to multiply the zoom ratio of a fully extended optical zoom. Because the image is changed after it hits the CCD, pixelization occurs when you enlarge it. Essentially, a digital zoom isolates a sector in the center of the optically derived image and blows it up. Since the pixels themselves are enlarged, the image doesn’t gain any actual detail. The picture won’t get any clearer, just bigger. In short, a subject’s detail is actually captured more faithfully with an optical zoom than a digital zoom.
With an optical zoom, the camera’s lens contains multiple elements that move in or out in relation to one another, creating a magnification factor. For a digital zoom, the a processor in the camera takes the image from the lens, and uses algorithms to interpret what the image through the lens would look like at a higher magnification.
Hi, Optical zoom depends on the camera lens. Clever motors move different parts of the lens to give higher or lower magnification – or zoom. Digital zoom is an even more clever. It is software, built in to the camera, which adds some additional magnification. Issues: – 1. Optical zoom will give better picture quality than digital zoom, so on your chosen camera, the image will be pretty good up to 3 x zoom, after that, you may notice a poorer image. 2. Digital zoom “samples pixels” and makes an assessment of what the “zoomed image” would look like. The quality is always never as good as using just optical zoom. Why camera producers do digital zoom, is that more zoom can be fitted into a smaller, and more convenient, package. Giving 15 x optical zoom: 3 x 5 = 15 – would require the camera to be much fatter, and less portable (plus software is cheaper than mechanics). In choosing a camera, the ones with higher optical zoom are generally going to produce better images than those with small
