The Pentax AF-540 FGZ is a professional grade flash with a guide number 178 at ISO 100/FT (54 at ISO 100/M). This hot shoe mounted, bounce-and-swivel, auto-zoom flash provides a variety of advanced flash applications, including P-TTL auto flash, high-speed synchronization and wireless P-TTL auto flash (when used with PENTAX DSLR cameras that support wireless flash operation) with PENTAX digital SLR cameras. The Pentax AF-540 FGZ includes an autofocus assist beam for focusing in low-light or low-contrast situations, and has a coverage of 24mm-85mm, and as wide as 20mm when using the included wide-angle adapter.
Below is the estimated recharge rate and flashes per power source, as estimated by the manufacturer (real world shooting could vary):
Alkaline batteries – approx 6s interval, 200 full discharges
Lithium batteries – approx 6s interval, 350 full discharges
NiMH batteries – approx 6s interval, 250 full discharges
Please Note: This flash does not have any input jacks for sync cords or battery packs and therefore cannot be used with some of our other products. Please call if you have any questions or concerns.