Or is often called the diaphragm or lens opening is functioning to regulate how much the lens opens. This function is more precisely located on the lens. Logically, the larger the opening, the more light will enter. Like a water faucet. The bigger we open the faucet, the more water will come out.
Writing the correct aperture is f / x. So when it is said his Aperture value is 5.6, then the correct writing is f/5.6. So do not be confused when someone said that the 2.8 aperture lens opening is larger than 5.6. Because if it was true mathematical writing, right? (f/2.8> f/5.6), but most of us are lazy to say f/2.8 or f/5.6, because we are simple people anyway ...: D
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