DA* 55mm 1.4 on K-1 good extreme corner sharpness? - PentaxForums.com
Pentax smc DA* 55mm 1:1.4 SDM review: Digital Photography Review
Amazon.com : HD PENTAX-D FA50mmF1.4 SDM AW Single-focus standard lens New-generation, Star-series lens Extra-sharp, high-contrast images Free of flare and ghost images, Black : Camera & Photo
Pentax HD Pentax-DA 55-300mm f/4-5.8 ED WR Lens 22270 B&H Photo
Amazon.com : Pentax SMC DA 55mm f/1.4 SDM Prime Standard Lens w/ Case for Pentax Digital SLR Cameras : Digital Slr Camera Lenses : Camera & Photo
Pentax smc DA* 55mm 1:1.4 SDM review: Digital Photography Review
Amazon.com : Pentax SMC DA 55mm f/1.4 SDM Prime Standard Lens w/ Case for Pentax Digital SLR Cameras : Digital Slr Camera Lenses : Camera & Photo