[kingking0406]

Hi All,

Please advise if I use 40d + 70-200 f/4 is usm + 1.4x extender can be shot for car racing?

40d + 70-200 f/4 is usm + 1.4x extender =448mm

on the other hand, can I use Af after I use the extender?

Thanks!

[gwu1]

我有lee個組合，但未影過賽車．

我估距離唔太遠，都應該夠用．係有自動對焦．

[kingking0406]

Hi C Hing,

The aperture will drop to F/4 x 1.4 = F/5.6 ?

[ckf593]

買其他牌子1.4x extender得唔得？
平的,要幾錢？

[alamwuhk2a]

光圈會跌做f/5.6
小小白is仲有af
冇錢就用kenko, 質素唔差過canon好多

[variosonnar]

kenko 1.4好似7-8舊水，幾年前用過，無乜問題。聽講成像同canon 1.4x無乜分別（除左價錢差幾倍..)

[ckf593]

買的時侯，要講conan 接環嗎？

[variosonnar]

要講明係canon :)

[calwkf]

kenko extender 係平好多... 但會用唔到 EF-S Lens. -_-"