Canon 24-70 F2.8L USM with 1.4 or 2.0 Teleconverter - Does it work?

Discussion in 'Canon' started by Cockpit Colin, Oct 10, 2005.

  1. Hi,

    I'm just wondering if anyone has tried either of these teleconverters with
    this lens?

    I'm curious to know if it will focus - or will focus automatically - or can
    be focused manually.

    Many thanks,

    Colin
     
    Cockpit Colin, Oct 10, 2005
    #1
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  2. Cockpit Colin

    Frank ess Guest

    My memory of the Canon-provided information is that the teleconvertors
    (they call tem "extenders") are designed and proven to work with
    lenses of focal length 135mm or longer.

    Click the Note link on this page:
    http://www.bhphotovideo.com/bnh/con...s&Q=&sku=220456&is=USA&addedTroughType=search

    or
    http://tinyurl.com/7bcv9
     
    Frank ess, Oct 10, 2005
    #2
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  3. Cockpit Colin

    Frank ess Guest

    Frank ess, Oct 10, 2005
    #3
  4. Cockpit Colin

    Douglas... Guest

    Sigma have just introduced extenders which they claim will work with all
    lenses. I've had no practical experience but when I went to buy a 2x for
    my now departed 20Ds, I was told it wouldn't work with that zoom.
     
    Douglas..., Oct 10, 2005
    #4
  5. Cockpit Colin

    C Wright Guest

    No, it will not work! I have the the 1.4 extender and the 24-70 lens and
    the extender will physically hit the rear element of the 24-70 before even
    getting close to being able to mount it. No real surprise there as Canon
    does not list that lens as one that will work with either extender.
    On the other hand the 1.4 extender and the 70-200 f2.8L is a great match!
    Chuck
     
    C Wright, Oct 11, 2005
    #5
  6. If you get the Canon ones they will but avoid the Canon 2X it's a bit
    of a dog unless you must have it. For the price of the pair I would
    buy the 70-200 f/4.0L for a few dollars more.

    Here are user reviews of them.

    http://www.fredmiranda.com/reviews/showcat.php?cat=31


    *********************************************************

    "I have been a witness, and these pictures are
    my testimony. The events I have recorded should
    not be forgotten and must not be repeated."

    -James Nachtwey-
    http://www.jamesnachtwey.com/
     
    John A. Stovall, Oct 11, 2005
    #6
  7. Cockpit Colin

    ArcadiaBlue Guest

    Tried that lens with a 1.4 canon extender and a 2 times Kenko last weekend.
    Both focussed well although the Kenko seemed a little soft but not much.

    regards

    Don
     
    ArcadiaBlue, Oct 11, 2005
    #7
  8. Cockpit Colin

    ArcadiaBlue Guest

    Cancel my last reply, the lens was the 70 to 200f2.8 NOT the 24 to 70.
    Sorry, need to get specs or just plain getting old

    regards

    Don from Down Under
     
    ArcadiaBlue, Oct 11, 2005
    #8
  9. Cockpit Colin

    Skip M Guest


    What I gathered from the press release on DPReview what that they would only
    work on Sigma lenses. "Digitally optimized tele-converters, exclusive to
    Sigma's telephoto and telephoto zoom lenses."
     
    Skip M, Oct 11, 2005
    #9
  10. Cockpit Colin

    dylan Guest

    dylan, Oct 11, 2005
    #10
  11. Thanks everyone.

    By the way, has anyone ever tried to stack a 1.4 and a 2.0 teleconverter
    onto something like a 70-200 at the same time?
     
    Cockpit Colin, Oct 12, 2005
    #11
  12. Cockpit Colin

    Frank ess Guest

    I'll admit to sitting here and staring at the three items, and
    wondering...

    With the horror stories about Mr Canon's repair rates, and the cost of
    the equipment, I haven't had the nerve.
     
    Frank ess, Oct 12, 2005
    #12
  13. Cockpit Colin

    Kelly B Guest

    I've considered it, but you would lose three stops of light and the
    ability to auto-focus, and I would imagine a big drop in image quality.

    Kelly
     
    Kelly B, Oct 12, 2005
    #13
  14. Ah - so you're saying I should get someone else to try it first ;)
     
    Cockpit Colin, Oct 13, 2005
    #14
  15. Cockpit Colin

    no_name Guest

    no_name, Oct 14, 2005
    #15
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