9 a bassa dispersione tipo fluorite, 1 a dispersione bassa speciale
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Dustin Abbott It is unquestionably still near the top in terms of build and performance, but Tamron’s 70-200mm F2.8 G2 is such a strong entry that the choice today is a little more complicated.[...] Its build is a cut above that of the Tamron and every bit as good (if not better) than the Canon or Nikon versions.
Obiettivo Sigma 70-200 F2.8 DG OS HSM Sports (Canon)