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Where can I find out how to take apart a Sigma 150-600mm contemporary lens?

There is a piece of dust behind the front element (or between the front elements - I can't find a schematic). I agree that if I were to tear it down further that I would need other tools. I've taken 35-50 or so older lenses down further and refurbished them, but I wouldn't attempt that with this new lens! IMO I don't think taking the front element out will present a realignment problem, it is usually a simple seating reassembly verses anything requiring an adjustment... But I could be wrong of course. The real problem is that I can't find any schematics, and the screws around the outer ring (which I think is the key to getting this job done) are like a very small 5 star torque vs a 6 star, and I don't have a clue where to get one of those drivers (shout out if you know). Bottom line is that I'm confident enough in my abilities, given the right tools, to risk the consequences vs trust the dealer to fix it. BTW the dealer told me they were an authorized Sigma dealer, but their name an purchase date are not on the warranty sticker, so I can't trust them to be an authorized repair shop either and I don't know if Sigma will honor the warranty now (not to mention weeks without the lens in any event)... or I wouldn't be looking into this option :( Thanks for all of your feedback!

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Taking it apart is not the problem - re-assembling it will be. Unless you have access to an optical laboratory, where laser instruments can measure the exact tolerances required, don't even think about it. You will be left with a pile of optical components, and a far higher repair bill than if you had just let the experts sort out the problem in the first place.

Posted on Dec 04, 2016

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  • questech Dec 19, 2016

    Still need help with what tools to use (very small 5 star (vs 6 star) anti intrusion screws - need a driver) and a schematic would be helpful.

    Also anyone that has opened this lens up before could help me out a lot with some minimal advice.

    I have stripped down many lenses and am use to working with them.

    This lens is new (unfortunately the dealer lied and told me he was authorized... not, so no warranty) and I don't want to dive into it blind.


  • Tony Parsons
    Tony Parsons Dec 19, 2016

    I really don't think 'a piece of dust' is anything to concern yourself with - many (I am tempted to say 'all') zoom lenses acquire dust merely through use, and it normally has an immeasurably minimal effect on image quality. If you are determined, go ahead, but if you do, I fear the worst.
    You Have Been Warned !!
    Good luck

  • questech Dec 19, 2016


    I appreciate your concerns.

    As mentioned, I am willing to take that risk. I've worked on many lenses, and whereas I am not a pro, I know my limitations, and this doesn't seem that difficult... IF I had the right tools and a schematic, and even better, some instructions.

    I only want to take off the front element, which is usually a very easy task. Of course Sigma may have engineered in some complexity, but I wouldn't know, because I can't get my hands on any information on this lens, or a service manual, or even a picture!

    I'm concerned because this isn't an ordinary piece of dust, it looks more like an aluminum flake. Now it may just be a big piece of dust (I hope), but if it is a metal flake I don't want it to dislodge and get into any mechanisms.

    Anybody have a source of useful information and/or tools??




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