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What do all of the numbers and letters in lens model numbers mean?

April 26, 2017Lens letters mean model Numbers

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What do all of the numbers and letters in lens model numbers mean?

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Lens model numbers seem cryptic at first glance, but it’s actually easy to break the code. Even though every manufacturer uses different letters to identify functions, at least the format is close to the same. Let’s analyze Fujinon’s newest ENG/EFP lens: HA22x7.8BERM-28 • HA=2/3 inch format high definition • 22=Zoom ratio from wide to telephoto • X=Multiplier • 7.8=Minimum (widest) focal length, in millimeters • B=Letter indicates flange focal distance • E=Internal range extender • R=Servo zoom • M=Manual focus • 28=Camera interface type To get the maximum focal length of the lens, multiply the zoom ratio (22) by the minimum focal length (7.8) to get 172 mm. Engaging the 2X range extender will result in focal lengths of 15.6 to 344 mm. Remember that a high zoom ratio doesn’t always yield a longer lens, e.g., 20 X 7 = 140mm versus 19 X 8.7 = 165mm. It’s the resulting number (the maximum focal length) that counts.