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Ricoh patent of GXR 33mm F1.8 Macro
Ricoh applied for a patent about 33mm F1.8 Macro lens. GR lens A12(33mm F2.5 Macro) will be renewed soon.
日本語ページはこちら(Japanese page is here.)
Patent: GR Lens 33mm F1.8 Macro
GR Lens A12 33mm F2.5 Macro
- Patent Publication No.2010-175627
- published 2010/08/12
- filled 2009/01/27
- Embodiment1
- focus distance f=33.1mm
- Fno=1.80
- image circle 28.4mm
- macro 1:2
- Floating focus mechanism
- so small lens
- other
- Patent Publication No.2010-175628
It was 9 elements 8 groups in GXR33/2.5, but it is 11 elements 10 groups in GXR33/1.8. I worry about very slow AF.
