Pentax AF540FGZ Auto Electronic Flash for Camera

The AF540FGZ Electronic-Flash unit features a large guide number of 54 (at ISO 100) and provides a variety of advanced flash applications, including advanced P-TTL auto flash, high-speed synchronisation and wireless P-TTL auto flash (when mounted on a Pentax SLR camera). When mounted on a Pentax Auto-focus SLR (after the Z-10 and including Digital Format models) equipped with an FA-, FA J-, DFA- or DA- series lens, the AF540FGZ automatically adjusts its angle of discharge to the lens' focal length. The AF540FGZ auto-flash unit also features a newly provided 'Digital' position on the focal-length conversion scale of the Zoom Head which can accommodate digital SLRs, Bounce Flash function with adjustable angles of -10 to 90 degrees vertically and up to 180 degrees horizontally, and Power-zoom flash head to cover angles of view for 24mm to 85mm lenses (in 35mm format). It is compatible with a range of batteries, and is able to run on either 4x AA alkaline batteries, 4x AA lithium batteries or 4x AA Ni-MH batteries. We advise using rechargeable batteries. Flash modes: P-TTL (TTL corrective auto flash, contrast-control auto flash); TTL (TTL auto flash); A (programmed auto flash); M (manual flash); SB (spotbeam emission only) Focal-length coverage: Zoom type, covering angles of view for 24mm, 28mm, 35mm, 50mm, 70mm, 85mm lenses (in 35mm format). 20mm angle of view covered with wide-angle panel Guide number: 54 maximum (at ISO100). Manual setting at 7 levels: Full, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 Flash interval and Battery life: Approx. 6-second interval, approx. 2