![]() A larger zoom ratio gives you more focal length options during shooting. Focal lengths for the CX2, for instance, are wide-angle: 28 mm = 4.9 mm, and tele: 300 mm = 52.5 mm.Īnother important factor is zoom ratio. The focal length is based on the CCD, CMOS size (much smaller than regular 35 mm film). Instead of using film, however, digital cameras use image sensors (CCD, CMOS) that vary according to camera model and/or manufacturer. That means that the image size (aspect ratio) for any 35 mm camera (even when there are slight differences) is 2:3 = 24 mm x 36 mm, and focal length displays are the same. You might be wondering why this smaller number is equivalent to 35 mm or 105 mm.Īctually, all of the film used by conventional 35 mm film cameras is standardized. However, the actual focal length value shown on the lens, such as f=4.9 – 52.5 mm, is much smaller than the catalog value. "The CX2 lens is a zoom lens that covers focal lengths from 28 mm to 300 mm" Product manuals and catalogs contain entries like this: Ex.) CX2 Let's revisit some of the checkpoints that we discussed in the " Wide-Angle Function" article. ![]() Compact cameras currently available on the market feature zoom lenses with a wide range of specifications. ![]()
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