Instead Equivalent Focal Length convention refers to a comparison to different camera with either 35 mm film or a Full Frame 1x sensor, for the focal length *IT* would use to see the same size field of view as your lens sees on your camera. The term Equivalent Focal Length is NOT the focal length of the lens you are using. The Field of View calculation necessarily uses the real focal length of your actual lens. Using Equivalent Focal Length instead of the actual real focal length will produce a huge error.
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