Opteka EF-790 DG Super TTL Autofocus Dedicated LCD Flash for Pentax K-30, 645D, Q, K-5, K-r, K-x, K-7 and Samsung GX-1S, GX1L and GX10 Digital SLR Cameras Works on all Pentax and Samsung Digital SLR Cameras Flash can be tilted 90Deg upwards and also swiveled 180Deg to the left and 90Deg to the right Versatile auto power zoom smoothly covers lenses as wide as 24mm and up to 85mm Features an illuminated LCD panel, Guide number (ISO100) 45(m)/148(ft) at 85mm Advanced 2nd generation flash technology, only compatible with rechargeable AA batteries (Lithium, Ni-cd and Ni-MH)