The image sensor determines the maximum video resolution at which you can shoot, usually either 4K or HD (high definition). Panasonic uses BSI (back side illumination) technology in its sensor to reduce noise (or incorrectly measured pixels) in the scene, which can be a problem when shooting videos in low light. However, for a pro-level camcorder from Panasonic, the image sensor could be as large as 1 inch, which greatly improves image quality. The majority of image sensors in Panasonic camcorders are 1/2.3 inches in size. Sensors that are larger in size create sharper images. The image sensor is the chip that measures the light coming through the lens to create the image for the video. Anywhere from 10X to 50X optical zoom is possible with Panasonic camcorders. Larger numbers equal greater magnification. Panasonic denotes optical zoom as a number with an X. Panasonic sometimes combines optical and digital zoom elements and calls it “Intelligent Zoom.” However, when shopping, you should focus on optical zoom numbers.
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This is superior to digital zoom, which refers to the magnification of images via software (and thus, some loss of image clarity). The term “optical zoom” refers to the movement of glass elements inside the lens to create magnification. The zoom lens allows you to stand in one place and significantly change the magnification of the scene. The optical zoom lens is a key part of any camcorder, giving it an advantage over DSLR and mirrorless still-image cameras trying to shoot video. Panasonic introduced its first digital camcorder in 2002, but it began making VHS camcorders in the mid-1980s.
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