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Both lens aperture and exposure time, hence diaphragm and shutter, affect the image in two different ways: 1°) By modifying the amount of light that reaches the sensor - the aperture affects the intensity of light, the shutter controls the time during wich the sensor i exposed to light. 2°) Each of them has also different effects on the image. The aperture value affects the depth of field,

First part I thought about writing some tutorials with the basics, to help those who approach for the first time in the world of SLR. The tutorial is divided into 2 parts, the first is essential, the second called “Further Reading” contains more complex concepts that is best ignored until there is very familiarize with the first part of the tutorial, and even then you might not ever feel the need