[火Ken]

如題..........買左Extender EF 1.4X II後用係支EF 300mm f/4L IS USM 就無問題，但用係大白度係咪無AF ？如果係就唔開心！！本來一心打算兩用添，早知買Extender EF 2X II la！！

[bzboy]

Why don't you asked this question on Canon Show room.
It will more better & clear...

[redink]

hi, 火ken,
大白+1.4XII 用0係非1糸機身係會冇左AF. 大白+2XII , 就算用1糸都要MF.

[photowing]

最大光圈少於5.6啊

[火Ken]

redlink c hing~ 你意思係；如果我上1仔3~4之類係有AF ma？？

[h0001244]

<<<<redlink c hing~ 你意思係；如果我上1仔3~4之類係有AF ma？？ >>>
Yes...


But some people use a tape to cover up the additional 3 pins to fake the camera that it is just a Big White without 1.4X, then Lens could focus.

[h0001244]

Found the link, open the photo and you will know
http://www.fredmiranda.com/TipsPage/index.html

[reflexboy]

even if we can fool the camera by covering those 3 contact points. i believe the af speed would be ridiculously slow!