Aperture
Aperture is a device that controls the quantity of light that passes through the lens. It is an iris type mechanism, which shrinks or grows in order to let in less or more light.
The numbers you usually see on a lens are:
Shutter Speed
The shutter is a mechanism that controls the exposure time of an image. This time can be manually set by using the shutter priority shooting mode from your digital camera. The numbers you'll use will look probably like this:
The shutter is a mechanism that controls the exposure time of an image. This time can be manually set by using the shutter priority shooting mode from your digital camera. The numbers you'll use will look probably like this:
15, 13, 10, 8, 6, 5, 4, 3.2, 2.5, 2, 1.6, 1.3, 1, 0.8, 0.6, 0.5, 0.4, 0.3, 1/4, 1/5, 1/6, 1/8, 1/10, 1/13, 1/15, 1/20, 1/25, 1/30, 1/40, 1/50, 1/60, 1/80, 1/100, 1/125, 1/160, 1/200, 1/250, 1/320, 1/400, 1/500, 1/640, 1/800, 1/1000, 1/1250, 1/1600, 1/2000 sec.
These numbers represent how long the light will be allowed to hit the digital sensor in order to capture the image.
ISO Speed
ISO speed shows how sensitive the image sensor is to the amount of light present. The higher the ISO, the more sensitive is the image sensor.
The ISO is represented by numbers:
ISO 50 | 100 | 200 | 400 | 800 | 1600 | 3200
Each number represents two times the sensitivity than the previous one. Higher ISO settings are very useful in low light situations, but the disadvantage of noise appears. The higher the ISO, the higher the noise levels you get.
ISO 50
ISO 100
ISO 200