" http://www.amazon.com/gp/product/B00DE75B0U?tag=httpcelebratf-20
Designed specifically for APS-C sized sensors and the Pentax K-mount cameras
Internal focusing and zooming allows for more usability and functionality
The 18-35mm is ideal for landscapes portraits still life snap shots casual and close-ups
Sigma 18-35mm F/1.8 DC HSM Lens for Pentax APS-C DSLRs"