“取景视差”别忘掉——DC取景技巧

对于数码摄影爱好者而言。一定对取景视差这个概念不陌生。然而对于初级摄影者。取景视差是一个含糊的概念。如果你平时仔细观察。一定会看到这样一个有趣的现象：当我们坐在奔驰的列车上眺望窗外的景色时，近处的房屋、树木等等。会在我们眼前飞快地掠过。景物方位变化较大；而远处的群山却运动缓慢，景物方位变化则较小。这种观察车外自然景物方位变化的感觉。叫视差。数码摄影也会出现类似的视差。不过，这种视差与坐在奔驰的列车上向窗外眺望的视差不同，数码摄影视差主要与相机取景器的技术性能相关、因取景装置的不同。视差会有大与小的差别。

An Experiment Model on Overall Understanding PPPOE Access Service and Administration

According to the protocol principles, the structure and the movement mechanism of PPP and PPPoE, it produces the method realizing PPPoE access service under the Windows2000 system, and discusses the superiority of the access technology in the teaching and the group experiment of students. In view of the blank of this kind of experiment in current universities and technical institutes colleges, it has the very high popular value.