3 asferici, 2 a bassa dispersione tipo fluorite, 3 a dispersione bassa speciale
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Dustin Abbott In many ways the Sigma 28mm F1.4 ART is the lens that the 35mm F1.4 ART should have been. It delivers better focus accuracy, richer image quality, and has a superior build [...] the price tag (though probably warranted by performance) may be steeper than many want to pay.
Obiettivo Sigma 28mm F1.4 DG HSM Art (per Canon EF)