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Sigma 12-24mm f/4 DG HSM Art full frame lens

introduction

  • unique 12-24mm ultra wide angle full frame AF zoom lens in various mounts (Canon EF, Nikon F (FX) and Sigma mounts)
  • competes with the Canon EF 11-24mm f/4L lens at twice the price but similar size, weight
  • announced Sept 2016

specs

  • 12-24mm f/4 full frame lens
  • Dust and Splash Proof Construction with rear rubber gasket but not as weathersealed as the Canon
  • Ring-type HSM Ultrasonic Focusing with full time MF
  • internal focus but zoom extends (unlike the Canon equivalent which has internal zoom)
  • no filter thread
  • no rear filter slot (the Canon lens does have one)
  • close focus 0.24m
  • 9 rounded blades
  • 16 elements in 11 groups - Super Multi-Layer Coating, F-Low Dispersion and aspherical elements, including an 80mm large-diameter molded glass aspherical element
  • 1151g (2.54 lb)
  • 132mm (5.2“) x 102mm (4.0”)
  • $US1600

reviews

    • excellent sharpness even wide open but best at 12mm, and even better when stopped down to f/5.6-8
    • corners less sharp as you zoom in
    • not as sharp as the Canon 11-24mm lens
    • well corrected CA and very good vignetting, only 2/3rds EV wide open - both better than the Canon lens
    • slight but complex barrel distortion at 12mm, almost disappears by 16mm, slight, complex pincushion at longer focal lengths - less than the Canon lens especially at widest zoom but more complex and more difficult to correct
    • measured T-stop for this lens is around T4.6-4.8
    • slight coma in corners and mild astigmatism of 3.4% but better than the Canon lens
photo/sigma12-24mm.txt · Last modified: 2017/03/28 09:04 by gary1