The metz 36 af 5 is the newest generation of the popular 36 series digital compact system flash designed with the modern dslr in mind the 36 af 5 for pentax includes p ttl metering manual zoom coverage from 28 85mm with a built in wide angle diffuser to provide coverage down to 18mm 35mm format easy to follow led readouts and a 90 degree bounce head powered by four aa batteries the unit is capable of up to 450 flashes at full power