APERTURE.

APERTURE

What is aperture?
How does it work?
What is the effect?

Aperture refers to the opening of a lens's diaphragm through which light passes. It is calibrated in f/stops and is generally written as numbers such as 1.4,2,2.8,4,5.6,8,11 and 16. The lower f/stops give more exposure because they represent the larger apertures, while the higher f/stops give less exposure because they represent smaller apertures.

So basically on the camera, where we can find aperture is at ;

That way, your aperture opens up and let more light into the camera sensor and increases your shuter speed. For your 18-105mm lens, The aperture varies between f/3.5 and f/5.6, so try to keep it in that range. If you are still getting blurry images, try increasing your ISO to a larger number such as 1S0 800. All 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).

HOW APERTURE AFFECT 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 on how sharp and blurry is the area behind your subject. Here's the equation.

The lower the f/stop- the larger the opening in the lens- the less depth of field- the blurrier the background.

The higher the f/stop- the smaller the opening in the lens- the greater the depth of field and the sharper the background.

How the aperture affects shutter speed the f/stop also affects shutter speed. Using a low f/stop means more light is entering the lens and therefore the shutter doesn't need to stay open as long to make a correct exposure which translate into a faster shutter speed. Again, the reverse is true, using a high f/stop means that less light is entering the lens and therefore the shutter will need to stay open a little longer which translate into a slower shutter speed