Pozri porovnanie http://www.dxomark.com/index.php/Reviews/Best-lenses-for-the-24M-Pix-Nikon-D7100-Best-standard-and-portrait-primes-and-zooms/Best-Standard-zoom-models-for-the-D7100
Doplnenie info: Of the top three, the Sigma is the more consistent performer over the range of focal lengths on the Nikon D7100. At just $669, and with an arguably more useful range, equivalent to a 26-77mm on a 35mm camera, the Sigma stands out as being exceptional value for money.
No cital som o tom ze ten problem moze nastat ale ze sa k tej sigme da kupit usb dokovacia jednotka a ponastavovat aj FF/BF. Asik to teda vyskusam ale zatial nemam ani tu D7100 stale som neni uplne rozhodnuty ci nikon ci canon
NIKON D7100 + SIGMA 17-50mm F2.8 EX DC OS HSM
zaregistrujte sa a presvedčte o mnohých z výhod byť členom