Stopping down a lens to answer someone just means changing to a numerically higher f-stop. At “wide open” using the Nikon 85 1.4 example lens described above, the maximum aperature is f1.4. Stopping down means taking the f-stop to 2.8, 4.0, 8.0. etc. which can improve or eliminate many things resolved at it’s maximum aperature. Generally speaking, a lens is also sharper stopped down a few stops instead of wide open. A lens with a maximum aperature of f1.4 is also called a “fast lens” vs a lens with it’s maximum of f4.0 or f5.6, which are generally referred to as slow lenses. Hope that helps.
Stopping down a lens to answer someone just means changing to a numerically higher f-stop. At “wide open” using the Nikon 85 1.4 example lens described above, the maximum aperature is f1.4. Stopping down means taking the f-stop to 2.8, 4.0, 8.0. etc. which can improve or eliminate many things resolved at it’s maximum aperature. Generally speaking, a lens is also sharper stopped down a few stops instead of wide open. A lens with a maximum aperature of f1.4 is also called a “fast lens” vs a lens with it’s maximum of f4.0 or f5.6, which are generally referred to as slow lenses. Hope that helps.
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