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Now, after we learn about aperture, the other triangle exposure is Shutter Speed. Here i bring from wiki.

In still cameras, the term shutter speed represents the time that the shutter remains open when taking a photograph. Along with the aperture of the lens (also called f-number), it determines the amount of light that reaches the film or sensor. Conventionally, the exposure is measured in units of Exposure value or EV, sometimes called stops, representing a halving or doubling of the exposure.

Multiple combinations of shutter speed and aperture can give the same exposure: halving the shutter speed doubles the exposure (1 EV more), while doubling the aperture (halving the number) increases the exposure by a factor of 4 (2 EV). For this reason, standard apertures differ by ?2, or about 1.4. Thus an exposure with a shutter speed of 1/250 s and f/8 is the same as with 1/500 s and f/5.6, or 1/125 s and f/11. Read the rest of this entry »

After we learn about exposure triangle, to make more clear about it, i post this article take from wiki. yeah, the aperture definition, and all about aperture.
here it is.

In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at the image plane. If the admitted rays also pass through a lens, highly collimated rays (narrow aperture) will result in sharpness at the image plane, while uncollimated rays (wide aperture) will result in sharpness for rays with the right focal length only. This means that a wide aperture results in an image that is sharp around what the lens is focusing on and blurred otherwise. The aperture also determines how many of the incoming rays are actually admitted and thus how much light reaches the image plane (the narrower the aperture, the darker the image).
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The triangle of exposure is a useful way to describe the relationship between the three aspects of exposure. Each vertex of the triangle represents one of the three variables, aperture, shutter speed and ISO. Adjust only one will make the picture darker or brighter and will alter the appearance of the picture based on what you changed. For example, using a longer shutter speed will introduce motion blur in your photo, but also make the picture brighter (increased exposure) due to more light reaching the sensor. The easiest way to understand is to see the image.
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