![]() Prime lenses-also called fixed lenses-can only capture one focal length. Zoom lenses allow you to capture a range of focal lengths using the same lens. There are two types of lenses: zoom lenses and prime lenses. The difference between a focal length range and fixed focal length will indicate if your lens is a zoom lens or a prime lens. Larger numbers indicate a narrower angle of view and higher magnification or zoom.ĭepending on the type of lens that you own, the focal length will either be listed as a range of numbers (e.g. Smaller numbers equate to shorter focal lengths and lower magnification. Measured in millimeters, focal length is the not the length of the lens, but how much of the scene will be in focus (angle of view) and the magnification (how large it will be relative to the original). Arguably, it’s the most important thing you need to know about your current lenses and it’s very important when buying new ones. Let’s break apart what both focal length range and maximum aperture mean for your own lenses.Įvery lens in your kit will have a focal length listed on the lens. Lens speed or maximum aperture will be listed as some number immediately following the letter f. Focal length range will be listed as XX-XX before the letters mm, (e.g. When comparing lenses, the two most important numbers are the focal length range and lens speed. ![]() ![]() Common Focal Lengths of Lenses & What They Are Used For.Learning More About Focal Length & Your Lenses.
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