Product Description<br />Further development of Canon's flagship Speedlite has led to the production of the 580 EX II. This is the premier Speedlite for all photographers/ including professionals. Newly designed to match with the EOS-1D Mark III in terms of improved dust- and water-resistance/ body strength/ and the ability to control flash functions and settings from the camera menu (EOS-1D Mark III only). Other features include improved communication reliability through its direct contacts/ and recycling time is both 20% shorter than the 580EX and is completely inaudible. Approx. 20% faster recycling time compared to 580EX Superior build quality/ including a metal foot for higher rigidity Max. Guide No. 58 at 105mm setting (GN 190/ feet) Auto conversion of flash coverage with compatible digital SLR cameras White Balance info communicated instantly to compatible digital SLR cameras Full swivel/ 180�� in either direction AF-assist beam/ compatible with all AiAF points on every EOS SLR Dust- and water- resistance to match the EOS-1D Mark III Specifications 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/ wi<br /><br />From the Manufacturer<br />Further development of Canon's flagship Speedlite has led to the production of the 580 EX II. This is the premier Speedlite for all photographers/ including professionals. Newly designed to match with the EOS-1D Mark III in terms of improved dust- and water-resistance/ body strength/ and the ability to control flash functions and settings from the camera menu (EOS-1D Mark III only). Other features include improved communication reliability through its direct contacts/ and recycling time is both 20% shorter than the 580EX and is completely inaudible.<br /><br />Speedlite 580EX II Flash Highlights<br /><br />Approximately 20 percent faster recycling time compared to 580EX<br />Superior build quality/ including a metal foot for higher rigidity<br />Max Guide No. 58 at 105mm setting (GN 190/ feet)<br />Auto conversion of flash coverage with compatible digital SLR cameras<br />White Balance info communicated instantly to compatible digital SLR cameras<br />Full swivel/ 180 degrees in either direction<br />AF-assist beam/ compatible with all AiAF points on every EOS SLR<br />Dust- and water- resistance to match the EOS-1D Mark <br />