Top 10 Most Popular Pentax Lenses Pentax smc P-FA 50mm F1.4 Pentax smc P-DA 40mm F2.8 Pentax smc P-DA 16-45mm F4.0 ED/AL Pentax smc P-DA* 16-50mm F2.8 ED/AL (IF) SDM Pentax smc P-DA* 50-135mm F2.8 ED (IF) SDM Pentax smc P-DA 18-55mm F3.5-5.6 AL Pentax smc P-DA 35mm F2.8 Pentax smc P-FA 77mm F1.8 Pentax smc P-M 50mm F1.7 Pentax smc P-FA 35mm F2.0 AL Wide-Angle Lenses Pentax smc P-DA 14mm F2.8 Penta