It's the best. Having the best flash has made more impact than upgrading to a 35mm sensor or having very expensive lenses. The extra power lights up the most distant objects possible & creates the most bounced lighting possible & gets you the fastest recharge time possible. It doesn't make any noises either.
Recharge time depends on the battery charge & the power setting. Manual mode with 100% power takes 30 sec to recharge using alkalines, 15 sec using old NiMH's, and 2 sec using brand new fully charged NiMH's. You'll go through lots of batteries using 100% power. It's still limited by physics.
E-TTL mode definitely reduces the recharge time & extends battery life by using just enough power. It's another matter of software overcoming physics to get the extra value. Using E-TTL within a few feet, the recharge time is almost instant.Get more detail about Canon Speedlite 580EX II Flash for Canon EOS Digital SLR Cameras.
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