See the official Ricoh GR Blog:-
http://www.grblog.jp/2011/08/gxr-mount-unit-0day-review-oldlens-newdays.php
Various XR Rikenon lenses are mounted to the GXR "body" via the latest M-mount module, with yet another mount adaptor/converter, the lenses include a 135mm/2.8, 16mm/2.8 Fisheye, 50mm/2.0 and the "Telemacro Converter".
A number of different downsized samples are posted. Have a look and go learn about the bright future of Pentax and K-mount lenses with Ricoh! ;-D
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