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Thread: 70-200mm F/4 IS USM Owners - MF Issue?

  1. 25-09-2011, 4:26pm #1
    darrenmars
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    70-200mm F/4 IS USM Owners - MF Issue?

    Hey guys,

    Just wondering if anyone else has noticed that when manually focussing their 70-200mm that it sometimes "slips"? ie you turn the focus ring and nothing happens? It tends to only happen if I turn the ring quickly, which is rare, but it's still annoying. Is it just my lens or is this part of the design? Everything else works great, just when I focus by man rather than by machine. I've also noticed that the AF seems slow, tho I don't really know for sure as my only reference point is my 17-40.
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  2. 26-09-2011, 8:04am #2
    unistudent1962
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    Not something I've ever experience with mine.
    If it's under warranty get it checked.
    Mark

    Canon 70D w/Grip l Canon 60D w/Grip l EF 100-400 f4.5-5.6L IS USM l EF 70-200 f4L IS USM l EF-S 15-85 f3.5-5.6 IS USM l EF 100 f2.8 USM Macro l EF-S 18-55 f3.5-5.6 IS STM l EF 50 f1.8 II l Canon EF-S 10-22 f3.5-4.5 USM l 430 EX II Flash l Rode Stereo VideoMic l Manfrotto 055XPROB + 498RC2 Tripod l Benro MP-96 M8 Monopod l Lowepro Vertex 200 AW Backpack l Lowepro Pro Runner 300 AW Backpack l PS CS5 Extended l Lightroom 4.3
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  3. 26-09-2011, 10:35am #3
    sdenness
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    Doesn't seem to happen with mine.

    AF is reasonably fast, although if it hunts through the whole focal range it takes longer than I want. I normally set the focus delimiter.
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  4. 26-09-2011, 11:15pm #4
    darrenmars
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    Hmmm... Unfortunately it's secondhand. Others have said it seems faulty or worn so maybe I should go back to the seller.
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  5. 27-09-2011, 10:46am #5
    MightyOz
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    Yeah good idea, i've had mine for a awhile now and never noticed that happening.
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  6. 19-10-2011, 11:07pm #6
    gje38752
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    Have same lens, never a problem, both man or auto focus smooth and very quick.
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  7. 20-10-2011, 7:10am #7
    Pine
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    Nope mine's fine
    Regards
    Bodies : Canon 450D, Canon 7D
    Lenses : Canon 15-85 f3.5-5.6 IS USM, Canon 100mm F2.8 Makro USM, Canon 24-70 L F2.8 USM, Canon 70-200 L F4, Canon 100-400 L F4.5-5.6L IS USM
    Editing : Photoshop CS5
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