yup... what hs said is true to what i've known.
And, almost ALL the sigma lenses i've owned for the past 10 years, including the later versions which were produced from 2003 onwards, have almost always fogged up after 2 -3 yrs of use.
Though sigma's warrenties its equipment for that, i still choose to use the lens and sell it after 2 yrs.
I read that it's due to the material within the lens (carbonate/plastic composites), and also, with their coating.
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