照风景时的理论最佳对焦距离(hyperfocal distance)应该是0.7m.所以我的结论是无前景时的风光照,手动对焦把镜头刻度对到0.7m到无穷远之间的任何一点,效果是一样的.
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近焦距离 Near focal distance
超焦距离 hyperfocal distance
齐焦距离 parfocal distance
对焦距离 Focus distance ; focusing distance ; MINIMUM FOCUS DISTANCE
后焦距离 back focus
聚焦距离 Focus Distance ; focusing distance
后退聚焦距离 Back Focal Distance
聚焦距离调节 Focusing distance regulated ; Focusing distance adjustment
最近对焦距离 Closest Focusing Distance
结果表明：随着聚焦距离的增加，焦面光强分布由中央凹陷状向高斯分布转变。
The results indicate that with the increase of focal length, the intensity distribution on the focal plane varies from central-dip form to Gaussian distribution.
一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。
Once mounted, the closer focusing range is attained by turning the lens to it's closest normal focusing point.
一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。
When focused near it's closest regular focusing distance, the lens will be difficult to mount OR unmount.
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