Your lens always remains what it actually is. Equivalent focal length is NOT a new focal length of your lens.
You will already know if it has meaning for you or not, and don’t otherwise worry about it.Ĭrop Factor CANNOT change your focal length. Understanding a reason to care probably is helped by some 35 mm experience.
FULL FRAME SENSOR SIZE FULL
However new users who have never used a 35 mm film or Full Frame camera won’t have use for Equivalent Focal Length, which describes the lens needed for a full frame sensor to see the same Field of View that your camera sees. Or you know that a 1.6x crop DSLR needs 24/1.6 = 15 mm lens to match that same 24 mm field of view on Full Frame. For example, if you are familiar with what a 24 mm lens does on 35 mm film (and many people certainly are), and if told a new compact camera’s tiny sensor and unimaginably short lens (maybe 4+ mm) has an Equivalent Focal Length of 24 mm on 35 mm film, then that tells you exactly what it will do, in your own terms. This is very good information in certain situations. This comparison then tells us what this smaller new sensor would see. Why would we want to know Crop Factor and Equivalent Focal Length? 35 mm film was the most popular film used, and its "full frame" size is the comparison standard, because the many of us with years of 35 mm film experience well know what result to expect from various focal lengths on 35 mm film. Specifically, the Equivalent Focal Length is the Equivalent lens used on the 35 mm film camera to see an equivalent Field of View as your camera and your lens sees. Equivalent Focal Length is a comparison with the Field of View seen by another camera, which conventionally is a full frame or a 35 mm film camera. Equivalent Focal Length is NOT about your camera, and does NOT affect your use of your camera.
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