
Ricoh recently filed a patent in a Japan for a 100-300mm f/4 full frame lens that is most likely designed for the Pentax K-1 DSLR camera. Here are the details:
Ricoh filed several patents in Japan for 75mm f/2.8, 50mm f/2.4, 25mm f/1.8 and 35mm f/1.8 lenses designed for cameras with 1 inch sensor.
Ricoh has a new patent application filed in Japan for a 200mm f/2.8 ED IF DC full frame lens (most likely designed for the Pentax K-1):
The latest Ricoh patents from Japan: → Ricoh has field a new patent applications in Japan for a lens with image stabilization and built-in low pass (AA) filter.
Ricoh filed a patent in Japan for a better visible AF patch / focusing points. See the before and after pictures from the patent application: Via Egami