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Sigma 20mm f/1.4 DG HSM Art full frame lens

introduction

  • 20mm super wide angle full frame lens in various mounts
  • world's first ƒ/1.4 ultra wide angle lens for full frame dSLRs (Nikon has a 20mm ƒ/1.8G lens, Sigma had a cheaper 20mm f/1.8 EX and then there is the Leica 21mm f/1.4, a $6,700 lens for rangefinders)
  • no filter thread!
  • not weathersealed!

specs

  • 20mm super wide angle full frame lens
  • no filter thread!
  • not weathersealed but will take a light shower
  • Sigma uses a new material called TSC (Thermally Stable Composite)
  • HSM AF
  • close focus 0.276m giving 0.14x macro
  • 15 elements in 11 groups, and includes 2 FLD (“F” Low Dispersion), 2 SLD (Special Low Dispersion) and 2 Aspherical elements
  • 9 rounded blades
  • 90.7mm x 129.8mm
  • 950g
  • $US900

reviews

photo/sigma20mm.txt · Last modified: 2017/03/31 08:43 by gary1