[Michael300]

請問有無師兄知道5D3用Tamron 24-70 時，可唔可以對應晒所有十字對焦點？

[hizaku]

技術上支鏡最大光圏時有 F2.8 已可用盡全部十字對焦, 少於 F2.8 時會當 F5.6, 十字對焦點會減少.

1Dx 就 F2.8-4 可用盡全部41個十字對焦點, F5.6, 只有21個十字對焦點.

[ncychan]

http://www.canon.com.hk/tc/product/catalog/productItemDetails.do?prrfnbr=200281

[Michael300]

但係以我所知並唔係淨睇光圈，因為舊版Canon 24-70L 都只係對應到中間一點，要新版先對應晒喎！

[千紅]

同意樓上

28-70L 能用盡中央5個對焦點
但24-70只能一個

[h0001244]

《《但係以我所知並唔係淨睇光圈，因為舊版Canon 24-70L 都只係對應到中間一點，要新版先對應晒喎！》》
同意，好難明白點解

[Michael300]

請問有無高人知道？

[h0001244]

http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/Tamron-SP-24-70mm-f-2.8-Di-VC-USD-review-A-uniquely-versatile-pro-worthy-alternative/Comparisons

[Michael300]

唔係好明喎，即係得唔得呢 h0001244 師兄？

[h0001244]

just took a glance, it is equivalent to Nikon 24-70....
should be just slightly worse than the Canon 24-70II
But with VC, personally love this VC much as if I need better image, I have prime already.