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doubled images on full zoom

Started Sep 29, 2016 | Questions thread
OP artemmur New Member • Posts: 8
Re: doubled images on full zoom

One more thing I would like to be clarified for me.
Is the spherical aberration is a thing which can be fixed with the USB dock which Sigma sells separately. Or spherical aberration is a matter of glass and mirrors used in lens build, so its cant be adjusted? 
Hope, I could explain what I wanted

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