Compare Pentax AF-540 FGZ TTL Flash to Quantaray XLF-50 TTL Flash for Nikon

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). Less

The Quantaray by Sunpak XLF-50 flash has a high guide number of 65 (ISO 100/feet) which will offer a much greater flash range over built-in flash units found in entry level digital SLR cameras. Flexibility is what the XLF-50 is all about with a 180 degree swivel control panel and hotshoe assembly for complete self-contained storage. Being so compact in the self-contained mode, it is small enough to fit in a pocket or bag at only 3.5-inches deep and less than 7 ounces. Less