Amazon.com : Pentax SMC PENTAX-F 50mm 1:1.7 AF F1.7 Auto Focusing Lens : Electronics
Amazon.com : Wide Angle/Macro Lens FOR THE PENTAX K-7 K-X Digital SLR CAMERAS.THIS LENS WILL ATTACH TO ANY OF THE FOLLOWING PENTAX LENSES 18-55mm, 50-200mm : Electronics
Pentax A 50mm F1.7 SMC Manual Focus Lens for Super Program Camera : Electronics - Amazon.com