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The Anatomy of a Lens

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The Anatomy of a Lens

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  • Author: Kyle Firestone, Nicholas Sischka, Lisa Tsang
Turning this changes the location where the lens focuses best. The distance from the first surface to the object is called the working distance. Turning this changes the size of the aperture stop inside the lens, and thus the F-number (f/#). In addition to controlling the overall amount of light that is able to pass through the lens, f/# has many other critical effects on lens performance. Used to temporarily lock the focus and/or iris in place to prevent unwanted adjustments. The lens information marked on the barrel of the lens and typically gives the focal length, minimum f/#, part number, and lens manufacturer.

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