[pkken476]

個體由後方衝前用AI 追唔到
由左至右追只能用一點追,除非用af 61,但電腦成日個焦點唔係我想要個d位
可能我用70-200II 較細光圈到係一個清其它化晒
有無辦法可令我追住一大班人跑,個個都咁shape

[smilebeaut]

又要一大班人跑又要大光圈又要個個都咁shape？
好似有D矛盾

[ncychan]

Ching, I used 5D3 with 70-200 L II too.

" 由左至右追只能用一點追, 除非用af 61, " --> You can use "Expanded AF" area with 6 or 9 points ( Correct me if it is not the official term.)

" 但電腦成日個焦點唔係我想要個d位 " --> Zoom in your object (target area) and make it well covered by your focusing points area BEFORE YOU HALF PRESS THE SHUTTER BUTTON.

Once you half press the shutter button, the AF will lock and track the object (providing you use AI-Servo mode). Finally full press shutter button at the "shininng moment" .

The success rate and result depend on some factors : your position from the moving object, light source, aperture/ Shutter speed/ ISO/ metering, focusing point selection, how big your object is covered/locked/ tracked by the AF system by your half press, how good timing you capture by full press.

" 又要一大班人跑又要大光圈又要個個都咁shape？ 好似有D矛盾 " ==> That's true.

For group running photo, try smaller aperture (e.g. over f 7.1) and shot from far distance. ( But don't expect it will be as "sharp" as solo close up/ / half / full portrait photos)

For single photo, try bigger aperture ( e.g. below f 7.1 to f 4. I don't suggest below f3.5) with close up / half / full portrait size and shoot from close distance.

My two pennies worth.

[kris_fish22]

用AI-Servo，F5.6/f4, 拍出嚟都係唔清, 靈敏度已經set到最高到最低都試過，唔知差d咩嘢。
用Expanded AF, 焦點可否跟物件移動而對焦？
好似冇以前7D/1D4個套咁易上手。

CHING請指教下。

[ncychan]

Kris_fish22 Ching,

拍出嚟都係唔清 ==> Any photo for reference ?