Opteka 750 DG Super TTL Autofocus Dedicated Flash for Pentax K-30, 645D, Q, K-5, K-r, K-x, K-7 and Samsung GX-IS, GX-1L, GX-10 Digital SLR Cameras
TheOpteka EF-750 DG SUPER TTLis designed to work with the all Pentax and Samsung digital SLR cameras, It has a maximum guide number of 85 feet or 26 meter at 35mm focal length (ISO 100). The EF-750 DG is an ideal flash unit for beginners in digital SLR photography, but it is also useful for hobbyists and professionals looking for a handy TTL flash unit offering an effortless bounce flash function. The bounce head can be tilted in 5 steps - horizontal, as well as 30, 45, 60 and 90 degrees.Features~ Bounce - Flash can be tilted in 5 steps - horizontal, as well as 30, 45, 60 and 90 degrees~ AF assist - LED light beam helps the camera to focus in low-light~ Automatic shutter speed setting~ Red eye reduction~ Flash readiness indicator~ Front and Rear Curtain Synchronization~ Battery-saving mode shuts down power after 5 minutes~ 1 Year WarrantySpecificationsType:Shoe MountGuide No:85' (26 m) at 35mmAF Illuminator:3.3ft-20ft/1-6m (50mm Lens)Flash Duration:1/500 to 1/30,000 secondTTL Dedication:YesBounce Head:YesRecycle Time:0.3-7 seconds (based on fresh batteries & full power)Power Source:Four rechargeable "AA" batteries (Lithium, Ni-cd & Ni-MH)Dimensions:75mm  x 85mm x 112mmWeight:230g (without batteries )