Bower SFD926P Power Zoom Flash for Pentax & Samsung SLR Cameras Auto power saving illuminated LCD display Guide Number: 112 feet (85mm @ ISO 100) Built-in Diffuser and Reflector Panel Compatible with all Pentax models including: K-7, K-5, K-R, K10D, K100D, K110D, K20D, K200D, K2000 24mm-85mm zoom coverage