Finally, a Solar Powered Camera that eliminates those troublesome batteries: batteries that always seem to go dead at
   all the wrong times.
What a great idea: no more battery worries. And best of all, this great Solar Powered Camera is a Ricoh.
 Ricoh Cameras are K-Mount Cameras and use all those great Pentax K-Mount Lenses.

The model of this great camera is Ricoh XR Solar.
It is just full of features such as:

    TTL metering system
    full metered manual operation
    shutter speed from 1 - 1/2000 sec plus B
    multi-exposure capability
    depth-of-field preview
    self-timer
    flash sync at 1/125
    uses Ricoh and Pentax K-Mount lenses
    completely SOLAR POWERED