HD Pentax-D FA★ 50mm f/1.4 SDM AW prototype lens review

The Japanese photographer Kimio Tanaka (who had previously released info on the Pentax-09 Telephoto macro lens) posted a review of the new HD Pentax-D FA★ 50mm f/1.4 SDM AW prototype lens (Google translation). Here is the recap by Mistral75:


  • length: about 11 cm (a first version of the text said about 11.5 cm)
  • maximum diameter: about 8 cm
  • weight: about 830 g
  • filter diameter: 72 mm
  • diaphragm with 9 rounded blades
  • minimum aperture: f/16
  • no coupling cam so KAF4 mount (electromagnetically operated diaphragm)
  • minimum focus distance measured on the scale: 0.4 m
  • working distance to the minimum focusing distance: about 25 cm
  • field coverage at the minimum focusing distance: approximately 18.5 cm x 12.5 cm (this would correspond to a maximum reproduction ratio of 0.19x)
  • the lens hood supplied at the same time as the lens is referenced PH-RBB72: it includes the classic removable window for adjusting a polarizing filter

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