Lenses include numbers that tell you the aperture and focal length of the lens. “FD” is an older version of Canon lenses replaced by an electronic “EF” mount. These letters are often used to separate similar lenses with different features within the same system.įor instance, “ FE” for Sony identifies the lens as a full frame, E-mount. There may be other letters with the “F” on some lenses. The zoom lenses that do not change the aperture as they zoom are more expensive. But when fully zoomed in, the aperture narrows to f/5.6. ![]() A lens reading of f/4.0-5.6 means that as the lens zooms, the aperture narrows. On telephoto lenses, there may be a range of numbers on either side of the slash (# – # / # – # or 1: # – #). Lenses with wider apertures let in more light and are generally more expensive. A lens reading 1.8 / 55 (or 1:1.8) means the lens’s maximum aperture is f/1.8. Some manufacturers express the f-stop as a ratio ((1: #). You may see a number, a slash, and another number, like this # / #. Your lens may or may not have the “F” on it. F-Numbers Represent Apertureį stands for f-stop or the speed of your lens. Let’s go over the main numbers and letters on lenses. What Do the Numbers and Letters on Lenses Mean? ![]() So let us look at the most common letters and numbers on camera lenses. But you can learn to decode the manufacturers’ shorthand with a few hints. ![]() This article covers what the numbers and letters on your camera lens mean. It can show the lens’ aperture, focal length, and other specifics. Manufacturers stamp lenses with details about the glass. What do the numbers and letters on lenses mean? You may have wondered when thinking about buying a new lens or looking at one you already own.
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