Ricoh filed two new patents for APS-C DSLR lenses: Pentax 15-45mm f/2.8 APS-C DSLR lens patent Focal length: 15.5～26.0～43.7 mm F number: 2.9～2.9～2.9 Half angle of view: 44.3～28.4～17.6 Image height: 14.24 mm Back focus: 35.592~50.304~67.802 mm Pentax 18-105mm f/2.8 APS-C DSLR lens patent Focal length: 18.5～43.5～101.9 mm F number: 2.9～2.9～2.9 Half angle of view: 39.0～17.8～7.7 … Continue reading Ricoh filed two new patents for Pentax APS-C DSLR lenses