Originally posted by nicholas1986
but don't forget that the 550EX is more powerful than the SB28
Here we go again. Falling victim to Canon marketing spiel. Or just massaging the figures again like you did with the lenses? The 550EX has exactly the same power output as the SB-28. Canon loves to trumpet their figures for consumers who should know better, in a similar way they claim IS, DO etc are the wonders of the world and you can't take good pictures without them.
Adjust those numbers down to an equivalent 35mm angle of view coverage, and you get a similar guide number of, erm, 36m. Yup, exactly the same. The only minor time you get a bit more juice is between 85mm and 105mm where the Canon zooms a bit more to concentrate the flash slightly more. GN difference in this case is a minor 50 v 55m. Already VERY powerful in either case, and a 10% difference.
I had this very same argument with Practical Photography. Some months back (prob more than a year now), they published one of their flash reviews. It was absolutely shocking, had several mistakes, and lots of inconsistencies. It was fairly clear they had just got someone to quickly read the specs and write the article. Among other things, they too claimed the 550EX was better value for money because it was more powerful than the SB-28. I wrote them an email and received the curt email that they didn't agree with me, but it would be forwarded to the editorial team anyway because I was entitled to my opinions. The worst reply I've ever had seeing as they completely bottled it. I never got any further reply than that.
Alas, a fellow pro in the UK also wrote to them and offered to donate £200 to charity if he was right and they were wrong. I don't think they ever did, but at least they acknowledged him and published a correction in the next issue. But I've never picked up another copy of the magazine since. Not as much for the errors but more for the way they brushed me aside.