Circular or Linear polarizing filter for EOS40D and EF 28-135mm IS?

Discussion in 'Digital SLR' started by Dennis, Apr 30, 2009.

  1. Dennis

    Dennis Guest

    As a gift for my daughter (I don't know about these things) I want to
    buy her a polarizing filter. But I am told there are two types. What
    should I get for a EOS40D and EF 28-135mm IS?
     
    Dennis, Apr 30, 2009
    #1
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  2. Dennis

    DRS Guest

    You want a circular polarizing filter, not a linear one. Pay the extra for
    a decent multi-coated one.
     
    DRS, Apr 30, 2009
    #2
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  3. Dennis

    jdear Guest

    Circular - 72mm
     
    jdear, Apr 30, 2009
    #3
  4. Dennis

    Guest Guest

    a circular polarizer is required for any camera with a beam splitter.
    autofocus slrs, including the canon 40d, have a semi-silvered mirror,
    so therefore you need circular.

    for a compact p&s camera or old manual focus slrs, you can use either
    one.
     
    Guest, Apr 30, 2009
    #4
  5. Dennis

    Dennis Guest

    Thanks to all who replied!
     
    Dennis, Apr 30, 2009
    #5
  6. Dennis

    Guest Guest

    I agree. Even if your camera did not need a circular type,
    your next camera might. A circular type works with all cameras.
     
    Guest, May 1, 2009
    #6
  7. I'm using B&W circular polarizer with the same lens,
    but the added weight of the filter messes up with IS.
    With IS on and filter in front, photos get blurry when
    you zoom in (80-135mm). The focus is correct, but
    it looks like motion blur... So, you should either
    warn your daughter to turn IS off when using it, or
    avoid buying her a gift that'll give her headache :)
     
    Guybrush Threepwood, May 1, 2009
    #7
  8. Dennis

    Guest Guest

    that should have absolutely *no* effect on stabilization.
    a polarizer is typically going to require a stop or two more exposure
    and maybe you're shooting at a slow enough shutter speed where the
    slower shutter speed becomes a problem. or maybe the filter is very
    dirty.
     
    Guest, May 1, 2009
    #8
  9. Yes, it should not, but it does :) With 28-135 the entire
    front element wiggles, and vibrates when IS is on. When
    you mount a heavier filter (and B&W's sure aren't light)
    it obviously loses a delicate balance which is essential
    for it's proper function. And I have done several tests
    which all came out blurry as hell, even with 1/2000s
    or 1/4000s exposure. No problem with 28-80mm,
    but the blur emphasizes with longer zoom extention.
    Believe me, it's not the case. I've been shooting for 28
    years now and there's no way I could make a mistake
    like a newbie :) I used the polarizer on a bright sunny
    day, and even if I needed to shoot at a slower shutter
    speed (and I didn't), IS should compensate without a
    problem.
     
    Guybrush Threepwood, May 2, 2009
    #9
  10. So using a lens hood or lens-protecting filter (such as UV) on your
    zoom should reduce the quality of your IS images, and if you use both
    the effect should be worse. Since that's much more common than the use
    of polarising filters, who has noticed that?

    It doesn't affect my images, but that may be because my camera uses
    in-camera rather than in-lens image stabilisation.
     
    Chris Malcolm, May 3, 2009
    #10
  11. Just a very poorly designed (or faulty) lens.

    David
     
    David J Taylor, May 3, 2009
    #11
  12. Dennis

    Guest Guest

    i've never seen a stabilized lens where the front element wiggles.
     
    Guest, May 3, 2009
    #12
  13. Dennis

    Ray Fischer Guest

    Mine doesn't.
    Are you an engineer?
    Your problems with a particular lens cannot be used to generalize.
    And yet ...
     
    Ray Fischer, May 3, 2009
    #13
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