Aperture

The aperture is the physical lens opening on your camera. It is adjusted to open and close in f-stop increments, allowing more or less light in with a larger or smaller opening. The iris diaphragm inside the lens of your camera is adjusted to alter the quantity of light that will reach your film. Each aperture opening, or f-stop, lets in twice as much light as the smaller f-stop before it, and half as much light as the larger f-stop after it. For example, f5.6 will let in twice as much light as f8, and half as much light as f4.

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Vintage Argus 3 Matchmatic Camera 50mm F3.5 with Case picture
Vintage Argus 3 Matchmatic Camera 50mm F3.5 with Case
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ARGUS C-3 MATCHMATIC, 50/3.5 ARGUS (DUST) + LC3 METER (DEAD), HAZY RF/190900
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ARGUS A & ARGUS C3 MATCHMATIC 35mm Cameras
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Vtg Argus Camera C3 Matchmatic Brick 35mm Wind - Original Leather
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Old Vintage 60's Argus Rangefinder C3 Matchmatic 35mm Camera + Case.