lsman1

原帖由 bobbylwl 於 2008-10-22 21:34 發表

咁細光圈sharp d都係呢個原因?

yes...
just to simplify it... Of course the lens actually convert them (compact it), but I am not stressing that point.

See the red lines.. its smaller than the green line... (the end will be film or sensor...or your eye viewfinder...)
細光圈 will make the image "sharper" because lens won't fall all over the place.

[ 本帖最後由 lsman1 於 2008-10-22 22:38 編輯 ]

licgfg

原帖由 bobbylwl 於 2008-10-22 22:11 發表

呢個我夠知
但係完全唔知點解光圈大細唔會影響視野

只要遮閉物係<focal length,就只會影響光暗而唔會影響視野