Question about Sigma Cameras
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!
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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Posted on Jan 02, 2017
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