When you are shopping for SLR Camera Digital Lenses, not all zooms are created equal. First of all, some of you may be wondering what a “zoom” is to begin with. Zoom is the ability to get a closer view of the object without having to move closer to it. SLR Camera Digital Lenses provide the ability to use optical or digital zoom capability.
Optical Zoom for SLR Camera Digital Lenses
Optical Zoom on SLR Camera Digital Lenses comprises of the physical adjustment of the lens components, thus focal length to achieve the desired close up on the object. Unlike digital zoom, optical quality is not compromised when using optical zoom lenses on digital cameras.
Digital Zoom for SLR Camera Digital Lenses
Digital zoom is a method of decreasing (narrowing) the apparent angle of view of a digital photographic image. Digital zoom is accomplished by cropping the desired section of an image andusing same aspect ratio measurements as the original image. The software either in the SLR Digital Camera of on the PC will interpolate the image to the pixel dimensions of the original image. This however does result in a loss of image quality as you are essentially covering the gaps between the pixels. By enlarging a smaller area the software makes a best guess of what those gaps should look like, which results in a loss of image sharpness and can sometimes even resultin blurred images.
Some digital cameras don’t have lenses (point and shoot) and rely entirely on digital zoom. A few SLR Digital Cameras with Zoom Lenses may also apply digital zoom automatically once its longest focal length has been reached.
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