Probably the smallest full-frame 35mm camera is the Rollei 35. The best models are those with a Sonnar or Tessar lens. No rangefinder, but not really necessary with the 40mm lens. The best of the series is the 35SE with a tack sharp f2.8 Sonnar and CdS light meter. Look at site http://www.cameraquest.com/rol35se.htm.