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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Carl zeiss jena tessar 50mm f2.8 M42 picture
Carl zeiss jena tessar 50mm f2.8 M42
M 62, Tessar 4.5 / 210, MINT cond., Carl Zeiss Jena, format 5x7 inch 21 ☆☆☆☆☆ picture
M 62, Tessar 4.5 / 210, MINT cond., Carl Zeiss Jena, format 5x7 inch 21 ☆☆☆☆☆
M 36, TESSAR 4.5 / 105, MINT con., Carl Zeiss Jena, CZJ n 32 10.5 ☆☆☆☆☆ picture
M 36, TESSAR 4.5 / 105, MINT con., Carl Zeiss Jena, CZJ n 32 10.5 ☆☆☆☆☆
M 71, Tessar 4.5 / 250, exc* cond., Carl Zeiss Jena, format 5x7 inch 250 ☆☆☆☆ picture
M 71, Tessar 4.5 / 250, exc* cond., Carl Zeiss Jena, format 5x7 inch 250 ☆☆☆☆
Exc+++++ Rollei Rolleiflex V TLR Tessar 75mm f/3.5 T Carl Zeiss Jena Lens No1295 picture
Exc+++++ Rollei Rolleiflex V TLR Tessar 75mm f/3.5 T Carl Zeiss Jena Lens No1295