T stop vs f stop4/24/2023 f-stop = lens focal length (mm)/ aperture diameter (mm) The f-stop is calculated by dividing the focal length of a lens in millimeters by the aperture diameter in millimeters. Technically, f-stop is the ratio of the lens focal length to the diameter of the aperture. While aperture refers to the hole in the camera lens that allows light to pass through, the f-stop, which is also called the f-number or f-ratio, is the number used to describe how wide or narrow the diameter of the aperture is. Often times you will read and hear photographers refer to f-stop and aperture as if they are the same thing, but they are not. Next, we learn how to numerically describe aperture diameter using the term f-stop. In this analogy, the iris is the diaphragm composed of aperture blades, the pupil is the aperture, and the retina is the image sensor. This is essentially the same way a camera records an image. The retina then converts the light it has received into neural signals that ultimately allow the brain to construct an image - the image being what the eye is looking at. When light passes through the pupil, it hits the retina at the back of the eye. The iris of a healthy eye automatically controls the amount of light passing through the pupil by widening and narrowing the diameter of the pupil. In the center of the iris (the colored part of an eye) lies the pupil, which is the small black hole in the eye that allows light to enter. By adjusting the aperture size, the photographer can control the amount of light hitting the camera sensor, and ultimately the exposure of an image.Ī classic analogy that is often used to explain aperture is the iris and the pupil of the eye. The amount of light entering the lens decreases as the aperture diameter is reduced.
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