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Thread: HELP! There is something wierd with my lens

  1. #1

    Default HELP! There is something wierd with my lens

    Hi guys I just bought a lens and the blades inside do not make a symetrical shape. Can someone tell me what is going on? It does not seem to effect the quality from what I can tell but I am still worried. Should I send it back to the manufacturer? It is a sigma
    Last edited by 2layers; 5th December 2006 at 12:41 AM.

  2. #2
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    Default Re: HELP! There is something wierd with my lens

    Quote Originally Posted by 2layers View Post
    Hi guys I just bought a lens and the blades inside do not make a symetrical shape. Can someone tell me what is going on? It does not seem to effect the quality from what I can tell but I am still worried. Should I send it back to the manufacturer? It is a sigma

    if you have not distorted, then 2 of the lens blade is defective. Under warranty, send it back.
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  3. #3

    Default Re: HELP! There is something wierd with my lens

    Quote Originally Posted by Del_CtrlnoAlt View Post
    if you have not distorted, then 2 of the lens blade is defective. Under warranty, send it back.
    maybe this is f/2.756 lens stop down to f/8.265?

    hahaha okie lame joke... sorry

    send back!!! if bought recently can try to exchange a new copy with shop, else send back to sigma

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    Default Re: HELP! There is something wierd with my lens

    Quote Originally Posted by slooow View Post
    maybe this is f/2.756 lens stop down to f/8.265?

    hahaha okie lame joke... sorry

    send back!!! if bought recently can try to exchange a new copy with shop, else send back to sigma
    actually, it will have nice bokeh on 1 side...
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  5. #5

    Default Re: HELP! There is something wierd with my lens

    Quote Originally Posted by Del_CtrlnoAlt View Post
    actually, it will have nice bokeh on 1 side...
    fwahahahahahhaahha

    ya... got to tilt the camera to the correct position hor?

  6. #6
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    Default Re: HELP! There is something wierd with my lens

    at least it still a heptagon shape

  7. #7

    Default Re: HELP! There is something wierd with my lens

    In my experience, not all apeture blades will stop down to exactly the same degree, causing what you see. This is more noticeable in apetures that feature lesser blades.

    Sometimes, it's a fault and can be rectified.

    Other times, it's just lower quality materials/poorer workmanship that may be inherent in a whole production lot. I've seen it in top name brand lenses as well, mostly cheaper primes and zooms that use less blades, but like you mentioned, it does not affect picture quality in any noticeable degree, unless it's due to sticking, which could get worse.

  8. #8
    Senior Member scandisk's Avatar
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    Default Re: HELP! There is something wierd with my lens

    just send it back for repair.....

    ...hmmmm....wonder why the pic turns out ok even when the blades are not "aligned"..

  9. #9

    Default Re: HELP! There is something wierd with my lens

    Sending it back today. thanks guys

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