TAILIEUCHUNG - Professional Information Technology-Programming Book part 8

Tham khảo tài liệu 'professional information technology-programming book part 8', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Stop the Action Although some blurring can be effective in communicating a sense of high-speed motion most of the time you want your subject frozen in time especially if you re shooting high-speed action such as sporting events or car races. The other problem that goes right along with freezing the action is managing to catch the most expressive instant that lasts for only hundredths of a second. . High Shutter Speed Considerations The first thing you need to know is just how brief your exposure must be to stop the action. You also need to know that the required shutter speed will increase with the angle at which the subject is approaching or going away from the camera. It is easier to freeze the action of a cyclist who s heading straight toward you than one who is passing perpendicular to you. You also have to consider how much of the subject you want to freeze. For instance the legs of a running horse or the wings of a flying bird are moving much faster than the body. So you have to decide whether you want the subject completely frozen or whether the blurred movement of some limbs or other parts simply makes the subject look like it s moving faster. A photograph of a flying airplane with frozen propeller blades will simply make you think the plane is about to crash. . Panning with the Subject If the subject is moving perpendicular to the camera s line of sight you can often keep the subject sharpeven at relatively slow shutter speedsby panning. Panning is lensman-speak for rotating the camera on a pivot point. The pivot point is usually the tripod thread. However if you re hand-holding the camera you just have to pretend there s a pivot point under the camera. The cyclist in Figure 2-13 was shot at a shutter speed of 1 30th of a second while the camera s spot metering point was centered on the tip of the seat. For a different subject just find any point that is at the center of the subject and at the same distance from the camera as the main body of .

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