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Thread: 7d+100-400mm+1.4tc mark3

  1. #1

    Default 7d+100-400mm+1.4tc mark3

    Is that true when fixing canon TC 1.4 MARK 3 cannot do AF? Has anyone has this problem? im new in photography line. need pros for advice. Thanks.

  2. #2

    Default Re: 7d+100-400mm+1.4tc mark3

    When racked out to 400mm with 1.4 TC, your aperture will be about f/8, so your cam may have trouble auto-focusing, since it does AF at f/5.6 or better.

    Do correct me if I'm wrong.
    My photo page: TDR Photography

  3. #3

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    It does not have auto focus at all. Only MF. But when I remove it the Tc then has auto focus on len. Any idea. Was it not supported on 7d Tc mark 3?

  4. #4

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    But it doesn't have auto focus when I fix the TC mark |||. I only do MF. Was it not supported for 7d using TC 1.4 mark |||

  5. #5

    Default Re: 7d+100-400mm+1.4tc mark3

    Your camera cannot auto focus if the aperture of the lens is above f5.6.

    Adding 1.4x on it means that your lens will be at f8.

    Only canon 1D series can maintain auto focus for lens up to f8.

  6. #6

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    Ahh I see...thanks for advice.

  7. #7

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    U meant only 1d series can maintain this? How about 5d?

  8. #8

    Default Re: 7d+100-400mm+1.4tc mark3

    Quote Originally Posted by skkyblue View Post
    U meant only 1d series can maintain this? How about 5d?
    only 1-series can maintain autofocus at f/8.
    Fujifilm X-Pro2 Graphite, X-Pro1
    XF 14/2.8, 18/2, 23/2, 35/1.4, 56/1.2, 60/2.4, 55-200/3.5-4.8

  9. #9

    Default Re: 7d+100-400mm+1.4tc mark3

    Quote Originally Posted by skkyblue View Post
    U meant only 1d series can maintain this? How about 5d?
    only 1-series can maintain autofocus at f/8.
    Fujifilm X-Pro2 Graphite, X-Pro1
    XF 14/2.8, 18/2, 23/2, 35/1.4, 56/1.2, 60/2.4, 55-200/3.5-4.8

  10. #10

    Default Re: 7d+100-400mm+1.4tc mark3

    wat im going to do with converter? sell it... i bought at 630

  11. #11

    Default Re: 7d+100-400mm+1.4tc mark3

    Quote Originally Posted by skkyblue View Post
    wat im going to do with converter? sell it... i bought at 630
    sell the 7D, get the 1D

    or

    sell the 100-400, get the 400 f/2.8

    or

    sell the 1.4xTC


    cheers!

  12. #12

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    Aiya have to sell off the teleconverter :-(.

  13. #13

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    If I trade my 7d get monster 1d atleast will spend another 5k, trade 100-400 buy 400 f2.8 atleast 7k. Wow...

  14. #14

    Default

    Thank all for advice.. Happy shooting on weekend...

  15. #15

    Default Re: 7d+100-400mm+1.4tc mark3

    You should have done some research before spending them money. If I am you, I might consider selling off 100-400L and get the sigma 120-300 f2.8 instead.

    Well, google "taping teleconvertor". Tape some of the pins in the 1.4x and see if af still works. Might be sluggish though.

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