EFS lens and teleconverter?

Discussion in 'Digital SLR' started by heathy, Apr 13, 2006.

  1. heathy

    heathy Guest

    Hi all, I have a Canon 70-300 DO IS (EFS mount) and generally happy as
    it is not huge and white.. however, finding that with wildlife shots i
    just cant get close enough so thinking of adding a teleconverter rather
    than spending out on a longer, heavier expensive lens. I have looked at
    the cannon ones but they done fit EFS lenses, does anyone know what my
    options are? even the Kenko Teleplus Pro 300 teleconverter doesn't fit
    I think? any help much appreciated..
     
    heathy, Apr 13, 2006
    #1
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  2. Good move if you like to degrade the quality of the image...
    --

    "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, Apr 13, 2006
    #2
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  3. heathy

    Prometheus Guest

    I didn't know that Canon made an EF-S version of the EF 70-300 DO IS USM
    lens.
     
    Prometheus, Apr 13, 2006
    #3
  4. heathy

    Frank ess Guest

    Nevertheless, it isn't on the compatibility chart for the Canon
    extenders.
     
    Frank ess, Apr 13, 2006
    #4
  5. heathy

    Prometheus Guest

    There are a lot of lenses not on the compatibility chart, that does not
    make them EF-S lenses
     
    Prometheus, Apr 14, 2006
    #5
  6. heathy

    Frank ess Guest

    1) EF-S or not, it isn't on the compatibility chart for the Canon
    extenders.

    2) No one said it did.

    3) ...horse you rode in on.
     
    Frank ess, Apr 14, 2006
    #6
  7. heathy

    default Guest

    To give you a useful answer, the Canon teleconverters won't work because
    they have a protruding front element that will interfere with your lens.
    Generally only the lenses on Canon's list should be used with their
    teleconverters. Sigma's teleconverters are similar and have the same
    problem.

    I have the new Canon EF 70-300mm IS F4-5.6 (not the DO version) and I
    sometimes use a teleconverter with it. It is the inexpensive Quantaray 2x
    AF teleconverter.

    http://www.ritzcamera.com/product/261660252.htm

    When using the teleconverter, at the short end autofocus confirmation works,
    but autofocus itself is unreliable since you are at F/8. At the long end,
    you are on your own with the manual focus since you are at F/11. The camera
    doesn't know you have a teleconverter on so it doesn't show up in the EXIF
    data. You have to manually remember that your real F-stop is two stops
    higher (or doubled) also. The image stabilization (IS) works fine with this
    TC however and is very helpful.

    Maybe I just have a lucky copy of this TC, but I can get very good results
    with it. The picture isn't quite as good as without it but almost always
    better than the results of cropping and upsizing. I have even tried it with
    my 50mm F1.8 (works as a 100mm F3.5 with the TC) which works well with full
    AF. You cannot mount EF-S lenses however on this TC, only EF lenses. The
    rear element of the EF-S lenses sticks out too far and prevents the lens
    from attaching to the TC.

    With manual focus, you are relying on your eyes seeing the image on the
    focussing screen sharply. I had to order an eyepiece diopter lens from
    canon since the built in adjustment didn't have quite enough range. Since
    then I can manual focus pretty well. With the TC, the viewfinder is dimmer
    by 2 stops though, so it is harder to focus. Really it is best when you
    have very high light levels.

    The picture does degrade a little bit. There is a bit of chromatic
    aberration with the TC, but this can be removed with photoshop easily. The
    sharpness is a bit less, but if your prints are not too large it isn't a
    problem and photoshop can help a bit here also.

    Perhaps others know if the Kenko and Tamron converters are similar.
     
    default, Apr 14, 2006
    #7
  8. heathy

    Thomas Guest

    heathy:
    As a general rule, teleconverters only produce good results with lenses
    designed for use with a teleconverter. That is because the center of
    the image is magnified, and the lense needs to be extra sharp there. A
    zoom usually does not have this extra sharpness, and if you use it with
    a teleconverter, you get a certain degree of blur in your image.

    So there is no cheap way to get this extra reach. Maybe you can find a
    used 300 or 400mm prime, and then combine it with a teleconverter.

    Thomas
     
    Thomas, Apr 14, 2006
    #8
  9. heathy

    Jan Böhme Guest

    heathy skrev:
    Why do you think so? According to this link, it works great´:

    http://tinyurl.com/r8n9p

    (Scroll way down to the sixth post from bottom, from a user called
    "Dante King", and with subject "Kenko 1.4X Teleplus DG Pro 300 TC with
    Canon 70-300 DO IS USM".)

    Jan Böhme
     
    Jan Böhme, Apr 14, 2006
    #9
  10. heathy

    heathy Guest

    thanks for your helpful suggestions, will look into the suggested
    options...
     
    heathy, Apr 16, 2006
    #10
  11. heathy

    AaronW Guest

    It is EF, not S.
    Canon teleconverters won't fit, but Kenko should fit this lens.

    You can try Olympus 1.45x. It goes in the front of the lens. When
    stopped down to f/11 (2 stops from wide open), the combo is sharp. And
    you keep auto focus.

    With a teleconverter that goes behind the lens, with a 1.4x the
    aperture is changed from f/5.6 to f/8, and you lose auto focus. If you
    stop it down a little to get sharper result, the combo is f/11 (1 stop
    from wide open) or dimmer.

    http://digitcamera.tripod.com/#slr
     
    AaronW, Apr 19, 2006
    #11
  12. heathy

    AaronW Guest

    It is EF, not S.
    Canon teleconverters won't fit, but Kenko should fit this lens.

    You can try Olympus 1.45x. It goes in the front of the lens. When
    stopped down to f/11 (2 stops from wide open), the combo is sharp. And
    you keep auto focus.

    With a teleconverter that goes behind the lens, with a 1.4x the
    aperture is changed from f/5.6 to f/8, and you lose auto focus. If you
    stop it down a little to get sharper result, the combo is f/11 (1 stop
    from wide open) or dimmer.

    http://digitcamera.tripod.com/#slr
     
    AaronW, Apr 19, 2006
    #12
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