Sigma 17-50mm f/2.8 EX DC OS HSM vs Tamron 100-400mm

  • Great for APS-C sensor cameras
  • Constant f 2.8 aperture
  • Sharp optics
  • Good value for money
  • Comes with a case
  • Great for wildlife and sports photography
  • Good autofocus performance
  • Heavy and bulky
  • Price can change frequently
  • Requires some muscle to use

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