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Firmware Update

Ricoh Patent - 60mm F2.8 Fullframe Macro Lens

Pentax-Fullframe-lens-paten

Latest Ricoh (Pentax is a brand name used by Ricoh Imaging Company) Patent information surfaced over the web, Ricoh/Pentax patent a 60mm F2.8 Fullframe Macro Lens with built-in optical IS.

Also see  – according to latest news / rumors – Pentax Full-Frame Coming on 2014

Description and self-interpretation of the patent literature (Google translated)

  • Patent Publication No. 2013-231941
    • Publication date 2013.11.14
    • Filing date 2012.4.6
  • Example 1
    • β = Inf – 1.00
    • Fno 2.9 -. 5.6
    • Focal length f = 59.98 – 61.13mm
    • Half angle ω = 20.0 – 11.0 °
    • Image height Y = 21.64mm
    • BF 37.11 – 82.21mm
    • 146.51mm – 90.13 total length
    • 10 pieces of 9 lens configuration
    • 2 pieces of 2 aspherical surface
    • One ED glass
    • Format 35mm full size
  • Example 5
    • β = Inf – 1.00
    • Fno 2.9 -. 4.9
    • Focal length f = 36.12 – 36.87mm
    • Half angle ω = 22.1 – 13.8 °
    • Image height Y = 14.24mm
    • BF 36.00 – 46.32mm
    • 137.64mm – 103.25 total length
    • 10 pieces of 8 lens configuration
    • One piece of one aspherical surface
    • One ED glass
    • APS-C format
  • Example 6
    • β = Inf – 0.50
    • Fno 2.9 -. 3.9
    • Focal length f = 92.28 – 81.86mm
    • Half angle ω = 20.4 – 15.9 °
    • Image height Y = 34.85mm
    • BF 60.00 – 73.09mm
    • 208.17mm – 182.00 total length
    • 10 pieces of 8 lens configuration
    • One piece of one aspherical surface
    • One ED glass
    • Format 645
  • Inner focus type macro lens
    • Impact of manufacturing error is large number of lenses
  • Feeding formula, macro lens of floating formula and
    • Impact of manufacturing error is small number of lenses is small
  • Ricoh patents
    • Formula feeding whole, floating formula and
    • (1 part of the second lens unit) vibration reduction

src-egami

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