\u201c\u9632\u624b\u9707\u201d\u529f\u80fd\u662f\u4ec0\u9ebc?\u5b83\u5982\u4f55\u4f5c\u7528?
\u66dd\u5149\u6642\u76f8\u6a5f\u7684\u9707\u52d5\u662f\u7167\u7247\u6a21\u7cca\u7684\u6700\u5e38\u898b\u539f\u56e0 \u5c3c\u5eb7\u7684\u9632\u624b\u9707(\u6216\u6e1b\u9707VR: Vibration Reduction)\u53ef\u4ee5\u5e6b\u52a9\u6e1b\u5c11\u9019\u500b\u554f\u984c\u7684\u767c\u751fCamera shake (unintentional movement of a camera during an exposure) is probably the most common cause of pictures being spoilt by a lack of sharpness. Nikon’s Vibration Reduction (VR) system helps to reduce the effects of camera shake.
\u9996\u5148\u5fc5\u9808\u5206\u6e05\u695a \u88ab\u7167\u4e3b\u984c\u7684\u79fb\u52d5\u548c\u76f8\u6a5f\u7684\u79fb\u52d5\u662f\u4e0d\u4e00\u6a23\u7684 \u524d\u8005\u9808\u8981\u7528\u9ad8\u901f\u7684\u5feb\u9580\u4f86\u201d\u51cd\u7d50\u201d\u5176\u904b\u52d5\u800c\u5f62\u6210\u975c\u6b62\u7684\u5f71\u50cf \u5728\u9019\u500b\u72c0\u6cc1\u4e0b \u9632\u624b\u9707\u529f\u80fd\u662f\u7121\u6548\u7684 \u5f8c\u8005\u5247\u662f\u76f8\u6a5f\u5728\u66dd\u5149\u6642\u9593\u5167\u4e0d\u662f\u5b8c\u5168\u975c\u6b62\u800c\u6709\u79fb\u52d5 \u5728\u9019\u7a2e\u72c0\u6cc1\u4e0b\u6574\u500b\u756b\u9762\u90fd\u6703\u6a21\u7cca \u9019\u6642\u4f7f\u7528\u6e1b\u9707\u529f\u80fd\u6709\u53ef\u80fd\u6709\u5e6b\u52a9 It is important to draw the distinction between subject movement and camera movement (camera shake). The speed of the former will dictate the shutter speed required to arrest that motion and render the subject sharply; VR has no effect on subject movement. However, if the camera moves in relation to the subject during the exposure, regardless of whether the subject is moving or not, there is a risk that some or all of the image may be blurred. It is in these circumstances that VR can be of benefit.
VR \u93e1\u982d\u4e2d\u6709\u4e00\u4e9b\u93e1\u7247\u662f\u88dd\u6709\u89d2\u901f\u5ea6\u611f\u6e2c\u5668\u7684 \u5b83\u5011\u53ef\u4ee5\u5075\u6e2c\u5230\u76f8\u6a5f\u7684\u5de6\u53f3\u53ca\u4fef\u4ef0\u89d2\u5ea6 \u53ca\u901f\u5ea6 \u7576\u6e1b\u9707\u529f\u80fd\u958b\u555f\u6642 \u9019\u4e9b\u611f\u6e2c\u5668\u4e0d\u65b7\u5730\u6e2c\u91cf\u4e26\u8a08\u7b97\u6a5f\u8eab\u7684\u5fae\u5c0f\u6296\u52d5 \u7136\u5f8c\u7531\u4e00\u7d44\u99ac\u9054VCM\u8fc5\u901f\u5730\u63a8\u52d5\u9019\u7d44\u900f\u93e1\u505a\u53cd\u5411\u7684\u79fb\u52d5\u4ee5\u70ba\u88dc\u511f \u901a\u5e38\u50c5\u9700\u8981\u5343\u5206\u4e4b\u4e00\u79d2 \u6700\u7d42 \u7d50\u679c\u5c31\u53ef\u662f\u8f03\u7a69\u5b9a\u7684\u5f71\u50cf
\u53e6\u5916 \u6e1b\u9707\u7cfb\u7d71\u9084\u80fd\u5224\u65b7\u50cf\u6a5f\u7684\u79fb\u52d5\u662f\u5426\u662f\u523b\u610f\u7684 \u6bd4\u5982\u8aaa \u7cfb\u7d71\u53ef\u4ee5\u5206\u8fa8\u651d\u5f71\u8005\u662f\u5426\u5728\u505a\u8ffd\u8de1\u651d\u5f71\u800c\u5927\u5e45\u5ea6\u64fa\u52d5\u76f8\u6a5f \u9019\u6642\u7cfb\u7d71\u5c31\u50c5\u6703\u53bb\u6e1b\u5c11\u4fef\u4ef0\u89d2\u7684\u9707\u52d5 \u800c\u4e0d\u53bb\u7406\u6703\u5de6\u53f3\u7684\u79fb\u52d5 (\u8b6f\u6ce8:\u6e1b\u9707\u7cfb\u7d71\u5c0d\u5927\u5e45\u5ea6\u7684\u52d5\u4f5c\u662f\u6c92\u6709\u8fa6\u6cd5\u6d88\u9664\u7684)
\u9019\u4e9b\u5224\u65b7\u90fd\u662f\u7531\u8907\u96dc\u7684\u7cfb\u7d71\u97cc\u9ad4\u57f7\u884c\u7684 \u5b83\u5011\u662f\u5c3c\u5eb7\u7d93\u904e\u9577\u671f\u7684\u6e2c\u8a66\u53ca\u7d71\u8a08\u4e4b\u5f8c\u7684\u6210\u679c
In the case of the panning technique, which involves swinging the camera deliberately to track a moving subject, VR can help by reducing the effect of camera movement in the plane perpendicular to the path of the camera’s motion. All Nikon VR lenses are capable of detecting a panning motion and only dampening camera movement in the opposite plane.
The VR Nikkor lens contains a group of elements that have two motion sensors attached to them. Nikon refer to these as ‘angular velocity sensors’; one detects “yawing” motion (rotation around a vertical axis), and the other detects “pitching” (rotation around a horizontal axis).
When the VR system is active these sensors detect information concerning lens movement continuously. Using the information calculations are performed instantaneously and based on the results of these the VR lens group is moved by a group of motors, known as Voice-coil motors (VCM), to an appropriate position that counters the effect of any unintentional lens motion.
The VR system continues to monitor lens motion and will adjust the position of the VR lens element group accordingly as soon as it detects any changes in the orientation of the lens. The micro-computer used to process the information from the motion sensors, perform the calculations, and send instructions to the VCMs operates in a faction of a second; typically taking no more than 1ms (1\/1000th second) to complete its functions.
Furthermore the VR system is capable of determining whether or not the motion of the lens is likely to be intentional, such as the technique of panning; in this situation only motion in the plane perpendicular to the movement of the lens is corrected. This is achieved by the use of complex algorithms contained in the firmware of the VR lens. These algorithms are based on a large sample of information collected from a wide variety of conditions that induce unintentional camera vibration; the microcomputer uses them to control the poisoning of the VR lens group.<\/p>\n","protected":false},"excerpt":{"rendered":"
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