A better combo would be the Canon 400mm f/5.6 with Canon 2X TC or the Canon 300mm f/4 IS with Canon 2X TC. These combos offer faster AF in many situations and offer similar or superior sharpness. With all this said I find the Tamron the best tool for the things I shoot (birds, sports) when I need the reach of a 400mm+ lens.

Hi, I have just purchased a Canon EF 2X III teleconverter, it's between a Canon 70D and a Canon EF 100-400mm IS-L USM lens. The TTL auto focus does not function, BUT, with the ground breaking dual pixel CMOS in the Canon 70D, I can use the lens's auto focus in LIVE VIEW. The length and weight of this combination means no hand held, tripod only.

Ethan Chang. 5分. 6樓. 呵呵，我也剛剛才買了一顆Canon Extender EF 2X III，我也是買來要裝在我的小白兔上面的。. 之前也是考慮了很久不知道要選哪一顆，各大網站論壇也都看了看，結果最後我選擇了Canon Extender EF 2X III. 因為我想對我來說，400mm的望遠拍攝比較是我所 Description These lenses can be used with either the Extender EF1.4X III or the EF2X III. Solution Usable lenses: *: Using an Extender with this lens may result in incorrect autofocus. If your camera has an AF microadjustment function, do the AF microadjustment.

0983 280 283 / 081 6686 888. duytan2802@gmail.com. ACB 691088888 - VCB 9983280283 - TCB 8869999666 - Le Duy Tan. Canon Extender EF 2x II Hãng sản xuất Canon Độ dài tiêu cự 2X 7 lá khẩu chịu thời tiết Định dạng tương thích Canon EF Độ phóng đại 2x Lấy nét tự động Kích thước (DxL) 3,5 x 3,8 x 5,3

I bought the sigma 2x extender for the 150-600mm and returned it. No autofocus and too much loss of light. Apparently the native canon 1.4x extender has less issues and autofocus works with one-point af up to f9 (or so I've heard). Edit: apparently the canon EF 1.4x III Extender has less issues with AF on the R6.
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    • canon extender ef 2x iii compatible lenses sigma