Lesson 1 aperture and depth of field
   First, we talk about "Iris", the aperture is a set of production activities in the lens which can be blades, by controlling the aperture size, you can control the light in a certain period of time, the amount of light entering the size of the camera. Generally take pictures of the process, we usually by adjusting the size of "Iris" and "Shutter," to complete a picture of the exposure.We study"Shutter" the next class to,then teachers have time to click the following numerical aperture back:

f1.4 / f2 / f2.8 / f4 / f5.6 / f8 / f11 / f16 / f22 / f32

  Above the aperture value is generally used on the camera lens aperture value, of which number the smaller the aperture (eg f1.4) it will be the greater amount of light, the greater the relative aperture number (say f22) of the amount of light rather small. So in general we say that a large aperture, is that the smaller aperture value of the numbers, this is often confusing for beginners.

  In between each set of adjacent aperture, there is "a grid" (or "level") between the amount of light. For example, aperture f1.4 and f2 are two bad a case of, f5.6 and f8 aperture between the two groups is a bad cell. Aperture of each cell is to multiply the amount of light growth, such as the amount of light is f4 twice f5.6, f2.8 is twice f4, so Daosuan back, f2.8 to f5.6 is the amount of light four times. In fact, do not count does not matter, as long as you know the current aperture of each cell is the gap between the amount of light can be a double, the other is to spend some time above the aperture down a few.

  Next we are going to talk about the "depth", depth of field is when we focus within the meaning of complete, fully aware of the film on the show (that does not look blurry) of the distance. Depth of field size and the length of the lens focal length, aperture size and distance photography close interaction. Usually the longer the lens focal length (for example, is a long shot), the larger the aperture, the closer the photographer, the more shallow depth of field; and the shorter the lens focal length (such as wide-angle lens), the smaller the aperture, photography, the greater the distance, depth of field will follow.

  Each one focus together, the aperture size of the different lens, its depth of field changes will be different. In most of the manual will be engraved on the lens often for users to determine the depth of field table, and auto-focus lens for the most depth of field using a simplified form. In our primary curriculum it does not teach you how to look at the depth of field tables, it is boring, and really rarely general photography will check it.

  As the depth of field is very important to a photo, in this course we should all experience in the use of different aperture and lens, there will be changes in how the depth of field. Familiar with their commonly used in the lens changes in the depth of field on the performance, the future can be more handy camera.

  First need a model to match with their own look (your friends and family is ok, and do not take beauty and ugliness, we are now is that the aperture for depth of field practice sessions, not in the photo shoot), and then find a the background site with more changes(for example, in the park), the camera connected to the shutter release on a tripod stand. Because we will be shooting in the use of small aperture, shutter speed may be pulled very slowly, if not using a tripod shooting, you may be shaking the screen.

  Ready to record with a pen and paper. First of all your favorite lens installed, check the lens aperture range from the largest to the smallest, and then record it. The lens in our example, starting from the maximum aperture of f2.8, then f4, f5.6, f8, f11, f16.

  Please models for positioning, we want to start a photo,who use the camera to automatically switch the camera to "Aperture Priority" mode. At first we began to shoot from the maximum aperture, the aperture and then adjust the sequence, has been photographed so far the smallest aperture, while do not forget to shoot you down when shooting aperture. People who use automatic cameras to meter because you can, so long as the order of the aperture to change it. Manual camera (such as FM2) who will own the right changes with each section of the shutter aperture value, anyway, is first set up the aperture, and then looking for the exposure OK shutter on the right. who do not know how to use the "aperture priority", or people will not be the correct exposure, please refer to your camera's instruction manual, which will teach you how to make the.