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
