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Olympus 12-40mm not fragile by the industry standards

Discussion in 'Back Room' started by New Daddy, Dec 31, 2013.

  1. dougjgreen

    dougjgreen Mu-43 All-Pro

    Jun 5, 2013
    San Diego
    Doug Green
    How many of these $1000 lenses that have been shipping for less than 3 months do people think are actually out there in the field? I'd be stunned if it were more than a few thousand units worldwide at this point. And yet, we have already gotten several reports of failures by the same failure mechanism. To claim that there is not SOME type of QA issue with this lens at this point is whistling past the graveyard. We don't know if it's a design issue, or if it's a broad-based manufacturing issue, or if it's a defect with a single manufacturing lot of these lenses - but I can absolutely guarantee that there is SOME issue causing this, well beyond that of mere random coincidence. Even three similar mount failures in the field at this early point in the life of this lens would be at least a couple of sigma outside the predicted failure rate at the lens mount for a brand new high-end product. It's appropriate to say that there isn't any reason to blame the fact that the lens mount is plastic, but it is most assuredly NOT appropriate to say that no bona-fide QA issue exists at this point. There is enough failure data to say with extreme confidence that an actual defect does exist - whether it is a design defect, or a manufacturing defect is unknown, and if it is a manufacturing defect - we don't know if it's a systemic problem or one bad manufacturing lot. But we can for sure know that an actual issue exists by three in-field failures of brand new product that has only shipped a few thousand units.
     
  2. Ricoh

    Ricoh Mu-43 Top Veteran

    978
    Nov 2, 2013
    UK
    Steve
    I really don't want to say much more, but @WasOM3user, I suggest any stressed plastic should have a metal insert. It's not my area of knowledge but the insert could be added (possibly) during the moulding process. The resulting increase in surface area - insert to plastic - would take a greater loading.
     
  3. T N Args

    T N Args Agent Photocateur

    Dec 3, 2013
    Adelaide, Australia
    call me Arg
    I think you misread him. "No more likely" is not saying "no incidents".
     
  4. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    I don't think I misread him. If he had even a single incident (of the lens breaking in the manner our members described), I don't think he could say that the lens seems no more likely to break than any other lens they currently ship.

    Sent from my SCH-I535 using Mu-43 mobile app
     
    • Like Like x 3
  5. T N Args

    T N Args Agent Photocateur

    Dec 3, 2013
    Adelaide, Australia
    call me Arg
    I am sure they have some lenses damaged. Therefore the likelihood is non-zero, by my calculation.
     
  6. WasOM3user

    WasOM3user Mu-43 Veteran

    458
    Oct 20, 2012
    Lancashire, UK
    Paul
    @Ricoh re "I really don't want to say much more, but @WasOM3user, I suggest any stressed plastic should have a metal insert. It's not my area of knowledge but the insert could be added (possibly) during the moulding process. The resulting increase in surface area - insert to plastic - would take a greater loading."

    Depends on the material used - some plastics work well with inserts some do not and thats before we start talking about the inserts being moulded in or heat staked or inserted using ultrasonics each of which gives different properties and can be more or less suitable for different grades or mixes of plastics. It can also make parts/units bigger and give problems with distortion from the thicker sections needed as well.

    Having re-checked all the pictures in the lens rental blog none of the Nikon, Canon, Sony or Tamron lenses have inserts for the mount screws either.
     
    • Like Like x 1
  7. jnewell

    jnewell Mu-43 All-Pro

    Jun 23, 2011
    Boston, MA
    What will be interesting and informative is the condition in which they come back to him. (I'm not being facetious - if equipment has weaknesses, Lensrentals will be on the receiving end of the problems.)
     
  8. jnewell

    jnewell Mu-43 All-Pro

    Jun 23, 2011
    Boston, MA
    I would guess a few thousand world-wide is right, and most of those would be sold in Asia, and most members here are from the Americas and western Europe.

     
  9. gr8Shot

    gr8Shot Mu-43 Regular

    99
    Nov 13, 2013
    It is not the plastic. It is the design.

    ROTFL. What amuses me is people who look at images of the 12-40 and think it is well built. There are many finely constructed plastics lenses. But the assertion that all plastic lenses are well built is laughable. I think everyone agrees, plastic lenses can be made to last.

    If you have worked on automobiles, appliances, electric devices or simply have an interest in manufacturing, you can distinguish good from bad. Each of the statements quoted above are generally true. But specific photos - and NOT failure statistics - show the 12-40 has poorly designed screw sockets. If the author of the article thinks the 12-40 is up to industry standards, let's hear it. All he said was 'the 12-40 may be defective'. That's not exactly a glowing enforcement. And it certainly does not imply that the 12-40 is even average.
     
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