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sigma 30/2.8 rattle

Discussion in 'Sony Alpha E-Mount Lenses' started by jlabate, Mar 31, 2012.

  1. jlabate

    jlabate TalkEmount Regular

    Aug 25, 2011
    I just received my Sigma 30mm/2.8 from B&H and when off the camera the lens has a deep rattle when shaken, like something's loose inside. It seems to perform ok but is this normal for a Sigma lens? I've used many other brand auto-focus lenses and never had one rattle like this.
  2. JJJPhoto

    JJJPhoto TalkEmount Regular

    Aug 8, 2011
    It is normal ... It is also mentioned in the literature from the manufacturer which came in the box with the lens. Everyone who bought this lens (including me) freaked out about it at first. It is just a side effect of the way Sigma designed the AF motor in the 30mm and the 19mm. When the lens is mounted and the camera is on it stops making the noise.

    I am sure Sigma could have designed the 19mm and 30mm without this AF component rattle, but you only really hear it when the lens isn't mounted and it's hard to complain too much about a brand new lens with excellent sharpness that only costs $200.
  3. Poki

    Poki TalkEmount Hall of Famer

    Aug 30, 2011
    I guess it was a decision they made to keep the price down. Not too bad if it's not there when the camera is turned on. As long as it's not a super expensive lens, I wouldn't complain.
  4. jlabate

    jlabate TalkEmount Regular

    Aug 25, 2011
    Thanks. Nice to be assured it's normal. And once mounted on the camera, the rattle goes away.
  5. davect01

    davect01 Super Moderator

    Aug 20, 2011
    Fountain Hills, AZ
    don't shake

    Then don't shake your lens, treat it gently.

    Seriously though, that should not be the norm.
  6. Dioptrick

    Dioptrick TalkEmount All-Pro

    Feb 4, 2012
    New Zealand
    Maybe the rattle (when unmounted) has something to do with the characteristic it's new and unique motor?

    "This lens benefits from a newly developed linear AF motor which moves the lens elements directly without the need for gears or the drive of other mechanical parts."
  7. JJJPhoto

    JJJPhoto TalkEmount Regular

    Aug 8, 2011
    Yep, it is the linear AF. I agree that a rattling lens is weird and doesn't promote confidence in the build quality, but the performance of this lens is GREAT for a $200 lens. It is like that old business saying (which I am paraphrasing), "You can have the best performance, the best build/style, and the lowest price ... but you have to pick only two." ;) 
  8. jlabate

    jlabate TalkEmount Regular

    Aug 25, 2011
    The rattle is easy enough to live with. I should have checked the manual but who reads manuals for lenses. And when I noticed the rattle, I didn't have the manual with me. The lens is a nice performer though. All the reviews about it being sharp corner to corner wide open are true. I like the focal length and love the price.
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