轉對焦環到合焦的地方後就定住不動
或者
自動對焦完成後~在把鏡頭切成手動模式~這樣就可以一直拍了~
我的習慣是先按af-on~構圖好之後在按快門釋放鍵
這在連拍的時候很好用~就不用一直花時間去對焦了!!
canon應該也有相對應的功能吧~要問一下玩canon的人了
至少我找到的都不是 "AF 對焦再切換到 MF 釋放快門"
(需要人工判斷合焦才釋放快門算哪門子的陷阱?)
Wikipedia: Autofocus - Trap Focus
A method variously referred to as trap focus, focus trap, or catch-in-focus uses autofocus to take a shot when a subject moves into the focal plane (at the relevant focal point); this can be used to get a focused shot of a rapidly moving object, particularly in sports or wildlife photography, or alternatively to set a "trap" so that a shot can automatically be taken without a person present. This is done by using AF to detect but not set focus – using manual focus to set focus (or switching to manual after focus has been set) but then using focus priority to detect focus and only release the shutter when an object is in focus. The technique works by choosing the focus adjustment (turning AF off), then setting the shooting mode to "Single" (AF-S), or more specifically focus priority, then depressing the shutter – when the subject moves into focus, the AF detects this (though it does not change the focus), and a shot is taken.
下面這一段樓主可以參考，言下之意 Canon EOS 系統要陷阱對焦還挺不容易的
Trap focus is possible on some Pentax, Nikon, and Canon EOS cameras. The EOS 1D can do it using software on an attached computer, whereas cameras like the EOS 40D and 7D have a custom function (III-1 and III-4 respectively) which can stop the camera trying to focus after it fails. On EOS cameras without genuine trap focus, a hack called "almost trap focus" can be used, which achieves some of the effects of trap focus.
可再參考這邊的做法...
Canon,,, Almost Trap Focus
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