Post on 13-Dec-2015
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Aperture What is aperture?aperture is the unit of measurement that defines the size of the opening in the lens that can be adjusted to control the amount of light reaching the film ordigitalsensor. The size of the aperture is measured inF-stop.2
How Aperture Affects Depth of Field
Depth of field is defined as "the zone of acceptable sharpness in front of and behind the subject on which the lens is focused." Simply put: how sharp or blurry is the area behind your subject. Here's the equation:The lower the f/stopthe larger the opening in the lensthe less depth of fieldthe blurrier the background.The higher the f/stopthe smaller the opening in the lensthe greater the depth of fieldthe sharper the background.
Where to Find the ApertureAll lenses have a maximum aperture, and all NIKKOR lenses list the widest possible aperture on the lens barrel. Some zoom lenses will detail something like f/3.5-5.6 on the lens barrel or 1:3.5-5.6 (below right). These numbers, the 3.5 and the 5.6, are referring to the maximum aperture or widest opening the lens can achieve for each end of the zoom range. Some higher end lenses can maintain the largest aperture throughout the entire zoom range, so only one number is detailed (below left).
ISOISO is short for International Standards Organization
What is ISO?In very basic terms, ISO is the level of sensitivity of your camera to available light. The lower the ISO number, the less sensitive it is to the light, while a higher ISO number increases the sensitivity of your camera. The component within your camera that can change sensitivity is called image sensor or simply sensor. It is the most important (and most expensive) part of a camera and it is responsible for gathering light and transforming it into an image. With increased sensitivity, your camera sensor can capture images in low-light environments without having to use a flash. But higher sensitivity comes at an expense it adds grain or noise to the pictures.