[sannaso]

增距鏡Extender EF 1.4X II,昨天剛買了小小白IS,想再玩遠d~加左Extender EF 1.4X II後最大光圈會變成5.6,還可有AF用,想請問如果我收細光圈如8-11 or more來影...還會有AF嗎?請指教!

[sannaso]

PS : 我用7D

[will爸爸]

收光圈跟增距無關的, 就正如小小白唔加1.4X 收到f8會無af一樣道理, 只有+ 2X, 最大光圈變成f8就會無AF....

[sannaso]

thank you very much!so do u know the Extender EF 1.4X II how much now?

[sannaso]

唔係wor ching,我而家即場就甘用7D + 小小白影,所有光圈都有AF wor....(就正如小小白唔加1.4X 收到f8會無af一樣道理?????)

[卍明仔卍]

canon 對焦時佢光圈會全開, 你按快門或影深預測時果下佢先會收做你set的光圈值

未加1.4時光圈全開是f4
加了1.4時枝鏡光圈全開都是f4,不過經過1.4後入到部機的光有如f5.6
部機經過電子mount又知你落左1.4所以佢同你計埋數演示f5.6光圈比你

[jenson123]

shing shing 1.4x is selling at 2850

[sannaso]

thanks~but i just want to know if i 加了1.4,if use 8-11,still have AF???

[sannaso]

any ching tell me????thanks X 1000

[nofeel]

樓上既都唔止答左你有, 仲解釋埋點解.

[calwkf]

用增距鏡只有最大光圈限制, 冇最細光圈限制.

1.4x 會細一級 (f/4 = f/5.6 : f/2.8 = f/4), 2x 會細兩級 (f/4 = f/8 : f/2.8 = f/5.6)

APS-C max. support F5.6
FF max. support F8

e.g. 70-200 F4 + APS-C 用1.4x, 光圈就會係f/5.6, AF function, 用2x, 光圈就會係f/8, AF not functional. 但如 70-200 F4 + FF 就可以用2x都可以有AF.

[sannaso]

thank you very much

[mickey9801]

順帶一提：7D中間的對焦點是f2.8的