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Accessories - D-SLR > Accessories - Pentax D-SLR > Digital SLR Accessories - Pentax - Flashes

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Pentax Flash AF540FGZ The PENTAX AF540FGZ auto flash unit features a large guide number of 54 (at ISO100/m). This clip-on, twist/tilt, 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 mounted on a PENTAX digital SLR camera. Suitable for K10D and K100D.   Physical Dimensions - 76 x 142 x 107mm Flash Exposure Compensation - In P-TTL mode, -3.0 to +1.0 steps (0.5-steps increments) Guide No - 45m at 50mm, 54m at 85mm  (ISO100, 35mm Focal Length) Effective Flash Range - Approx. 0.8m - 8.0m Flash Sync Mode - Leading-shutter-curtain sync, Trailing-curtain-sync, Contrast-control-sync, High-speed-sync, modelling flash, Wireless flash Battery Type - Four AA size batteries (alkaline, lithium, Ni-Cd, NiMh) Weight Loaded - 380g Bounce Head - Yes, (-10º, 0º, 30º, 45º, 60º, 75º, 90º) Swivel Head - Yes, Right: (0º, 30º, 60º, 90º, 120º, 150º, 180º), Left: (0º, 30º, 60º, 90º, 135º) Zoom Head - 24-85mm (flash senses focal length automatically)   To get started, DCW recommends.... ... rechargeable batteries & a charger   Specifications Type Clip-on, TTL auto zoom flash unit with serial control Guide Number Feet @ ISO 100 in manual mode, seven-step adjustment from 1/1 to 1/64 Focal Length (Zooming position) 85mm 70mm 50mm 35mm 28mm 24mm 20mm* [M 1/1] [=FULL] 177 164 148 128 115 105 69 [M 1/2] 125 115 105 90 80 74 48 [M 1/4] 88 80 74 64 56 52 33 [M 1/8] 62 56 52 44 39 36 23 [M 1/16] 44 39 36 31 28 25 16 [M 1/32] 31 28 26 21 20 16 11 [M 1/64] 22 20 18 15 14 11 8 Flash Duration [M 1/1] flash: approx. 1/1200 sec. Fastest duration time: approx. 1/20000 sec. Recycling time/Total Flashes Battery Type Recycling Time Flashes Alkaline (LR6) Approx. 6 sec. Approx. 200 Nickel hydroxide (Ni-MH) Approx. 6 sec. Approx. 250 Lithium (FR6) Approx. 6 sec. Approx. 350 Consecutive Discharge Approx. 2 frames/sec for 50 pictures, at [M 1/64] output (with alkaline LR6 batteries) Flash Coverage Angle Auto zoom enabled with autofocus compatible camera and lens combination   Zooming position 85mm 70mm 50mm 35mm 28mm 24mm 20mm* Vertical Coverage 23o 26o 34o 45o 53o 60o 85o Horizontal Coverage 31o 36o 46o 60o 70o 78o 98o Colour Temperature Daylight Effective Flash Range Approx. 2.6ft – 26.3ft (Guide No. 148, ft @ ISO 100, f/5.6) AF Spotbeam Red beam emitted under low light or low-contrast conditions Compatible Film Speed ISO 25 – 1600 Flash Modes P-TTL auto, TTL auto, auto, manual Flash Exposure Compensation In P-TTL mode –3.0 to +1.0 steps (0.5 step increments) Flash Amount Setting With wireless slave: [1/1, 2/3, 1 / 2, 1 / 3] Manual: [1/1, 1 / 2, 1 / 4, 1 / 8, 1 / 16, 1 / 32, 1/64] Flash Sync Mode Leading-shutter-curtain sync, trailing-shutter-curtain sync, contrast-control-sync, high-speed-sync, modelling flash Wireless Flash Control system: Optical pulse transmission Wireless position Master (M), control (C), slave (S) Channels 1 through 4 Compatible modes P-TTL, auto (A), manual (M) Effective range Approx. 13ft (according to Pentax testing conditions) Bounce Flash Up: -10o, 0o, 30o, 45o, 60o, 75o, 90o Right: 0o, 30o, 60o, 90o, 120o, 150o, 180o Left: 0o, 30o, 60o, 90o, 135o Power Saving Automatic power-off: After approx. 3 min. of non-operation with the power in the ON position, 6 min. in Auto, 1 hour in wireless mode Red-eye Reduction Operates with autofocus cameras equipped with red-eye reduction feature Modelling Flash Modelling button fires flash consecutively for 1 second Wide-angle Panel Pull out manually, flash zoom position automatically sets to 20mm Catchlight Panel Pull out manually LCD Panel Illumination Light button illuminates the LCD panel for about 10 seconds, or press button again to turn off Power Source Size-AA batteries x 4, Alkaline LR6, Nickel Hydroxide (Ni-MH), or Lithium FR6 Dimensions 3.0”x5.6”x4.2” Weight 13.4 oz without batteries