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Không thể như thế mãi ..... sà hay cất? :-) ...... Ngoại trừ săn mồi ..... Sẽ cất thôi ...... dễ quan sát hơn ...... phòng chống tội phạm mà .... LOL!!!!
Tôi có cái Canon extender x2 xài chung với 70-200mm trước đây, focus nhanh lắm, nhưng gắn vô cái 100-400mm thì thua. Muốn mua them cái x1,4 mà ngán tiền, bò cái x2 thì uổng. Hình như cái Sigma x1.4 còn focus nhanh hơn của canon nữa đó.
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