Canon have updated the 580EX speedlite to go with the new EOS 1D MkIII. It doesn't look like a very big upgrade, mainly a faster recycle time and a little better construction and weathersealing. However it does include an external metering sensor for non-TTL automatic flash exposure control and a PC socket for use with non-dedicated slave triggers, which could be useful in using the flash with non Canon-EOS bodies.
The popular Speedlite 580EX Flash is being replaced by the new Speedlite 580EX II Flash, which features a host of improvements, including a metal hot shoe with an improved locking mechanism for added durability, an external metering sensor for non-TTL automatic flash exposure control and a PC socket for use with non-dedicated slave triggers. Fully compatible with all EOS SLRs, the new Speedlite 580EX II is gasketed for dust and moisture resistance, making it possible for users of EOS-1 class digital SLRs and many L-series EF lenses to use flash safely when shooting in dusty or wet environments.
|Compatible Cameras||E-TTL operation with all EOS digital SLRs; PowerShot G2, G3, G5, G6, and Pro1; and the following EOS film cameras - EOS-1v, EOS-3, Elan 7N series, Elan 7 series, Elan II series, Rebel T2, Ti, K2, GII, G. TTL operation with all other 35mm EOS SLRs, and Canon T90.|
|Guide Number||190 (at ISO 100, feet) / 58 (meters); flash head at 105mm zoom setting|
|Number of Flashes||Approx. 100 to 700, with fresh AA-size alkaline batteries|
|Recycling Time||Approx. 0.1 to 6 seconds, with fresh AA-size alkaline batteries|
|Flash Range||(At ISO 100, with 50mm f/1.4 lens at f/1.4) - Approx. 1.6 to 98.4 feet / 0.5 to 30m|
|AF Assist Beam||Built-in; covers all focus points in EOS cameras with 1, 3, 5, 7, 9, or 45 AF points; Distance range - 2 to 32.8 feet (0.6 to 10m) at center; 2 to 16.4 feet (0.6 to 5m) at periphery|
|Custom Functions||Fourteen Speedlite Custom Functions built-in; set on Speedlite's LCD panel|
|Power Source||Four AA-size batteries - alkaline, lithium, or rechargeable Ni-MH usable|
|External Power Source||External power supply - compatible with Dust- and water- Resistant External Power Pack, Canon battery pack CP-E3 and Transistor Pack E|
|Dimensions||3.0 x 5.3 x 4.5 inches /76 x 134 x 114mm|
|Weight||13.2 oz./375g, without batteries (4 AA alkaline batteries add 3.5 oz./100g)|