Sigma 120-300mm F2.8 EX DG OS HSM
Announced Sep 21, 2010 •
Telephoto zoom lens | Canon EF, Nikon F (FX)
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In my first attempt to cover my need for ~500-600mm reach for motorsports & aviation i went for the highly praised 120-300 OS HSM (2012 model) + the Sigmas TCs. After almost a year of endless tests , discontentment and inspection and maintenance travels even to Sigma Japan with actually minimal final field use (just couple of pics) because of focus & tracking issues, i am coming to the conclusion that this combination DOESN'T WORK for action / sports photography. The AF performance of this...