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Lesson 2 and three quarters. Angle


The angle, measured in degrees, indicates the breadth of the field by the lens.

The coverage angle is the angle of projection lens plane focus of the sensor, the ability of the lens cover completely the format of the sensor.

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Lesson 2 and a half. The focal length


wide angle, normal or telephoto lens. Here's how and why.

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Lesson 2 - The Rule of 16 sensor


A card with information about the size of the sensors and the multiplication factor to determine the effective focal length of objectives.

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The rule of 16 was the rule that was used for exposure (aperture and shutter speeds) without a light meter.

The rule was simple: a beautiful sunny day = 16 aperture and shutter speed equivalent to film speed (ISO).