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Below is how the 2 units compare side by side. Many shooters here who use a variety of systems find the Metz 58 AF-1 to out perform their manufacturers flagship flash. Noted advantages are better sync'ing when used off camera. Most of the comments are the 58 would sync with a camera in positions that the manufacturers flash would not. Other feedback is the 58 has more consistent light output and has no over heating issues when used with battery packs. Metz mecablitz 58 AF-1 Guide Number
138' (42 m) at 50m
192' (58 m) at 105mm Pentax AF-540 FGZ P-TTL Guide No. 68' (21 m) at 20mm 105' (32 m) at 24mm 115' (35 m) at 28mm 128' (39 m) at 35mm 148' (45 m) at 50mm 164' (50 m) at 70mm 177' (54 m) at 85mm Metz mecablitz 58 AF-1 Angle of Coverage 84 to 23° (24-105mm lenses in 35mm format) 100° (18mm) with included wideangle diffuser Pentax AF-540 FGZ P-TTL Angle of Coverage 60° to 23° (24 to 85mm in 35mm format) 85° (20mm) with built-in wide angle diffuser Metz mecablitz 58 AF-1 Auto f/Stops f/1, 1.4, 2, , 2.8, 4, 5.6, 8, 11, 16, 22, 32 & 45 Pentax AF-540 FGZ P-TTL Auto f/Stops Full TTL at all apertures (with TTL-capable Pentax cameras) Metz mecablitz 58 AF-1 Variable Power 25 Levels ranging from 1/1 to 1/256th Pentax AF-540 FGZ P-TTL Vari-Power In Manual mode: 1/1, 1/2, 1/4th, 1/8th, 1/16th, 1/32nd, and 1/64th With wireless slave: 1/1, 2/3rd, 1/2, 1/3rd Metz mecablitz 58 AF-1 Zoom Head 24-105mm (Auto zoom, flash senses focal length & adjusts; Manual zoom) Pentax AF-540 FGZ P-TTL Zoom Head 24-85mm (flash senses focal length automatically) Metz mecablitz 58 AF-1 Recycle Time 5 Seconds (based on fresh alkaline (batteries & full power) 2.5 Seconds with optional P76 Power Pack (at full power) Pentax AF-540 FGZ P-TTL Recycle Time (based on fresh batteries & full power) 6 Seconds with alkaline, NiMH, & lithium 4.5 Seconds with TR-III battery pack
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