[jcx1166]

Anyone used Canon extender 2X and can give some advice whether it will impact the focus speed? Any sample of photos to share? Thanks

[老叟]

before you buy, check theccompatible lenses list, only a few lenses fit!!

[jcx1166]

OK thanks. I am using 70-200mm IS f/4, but just wonder the speed of focus and shaking effect.

[yiu_hei]

你用左光圈細兩級...

除非你用1仔唔係無左自動對蕉架喎...切記切記

[Round]

I don't think 70-200 f4 can use X2

[Galantvrm]

70-200F4L用得但會無左AF

[overover]

Surely it will lower the focus speed.

[jcx1166]

Does this means has to use Manual focus?

[pongyee]

...When combined with the Canon EF 1.4x (II) converter the speed is reduced as a side effect of the smaller max. aperture (one stop slower). In theory it is also possible to use a Canon EF 2x (II) converter but the effective max. aperture of this combination drops to f/8 so all consumer grade Canon EOS (D)SLRs will disable AF operations ...

sources : http://www.photozone.de/Reviews/Canon%20EOS%20Lens%20Tests/195-canon-ef-70-200mm-f4-usm-l-test-report--review

[yiu_hei]

要MF..

無記錯CANON除左1仔可以F8仲對到蕉外

其他機最少F5.6

你用1.4都仲得~

[jcx1166]

pongyee: thanks for very good site resource.

[JSmith]

唔一定要用原廠，Kenko都唔係差

[kingkonghk]

>>唔一定要用原廠，Kenko都唔係差

$500賣俾你, 只用過1次

[william_lau]

>>$500賣俾你, 只用過1次

你係咪廿蚊收，而家五百蚊賣呀？ 都幾好賺喎。 XD

[pongyee]

jcx1166,

u r welcome.