> Date: Tue, 11 Apr 2006 08:27:31 -0700 > From: "Kotsinadelis, Peter (Peter)" <[EMAIL PROTECTED]> > Subject: RE: EOS 550EX vs. 580EX > > Ken Lin wrote (edited): > I have both, so here are some 580 advantages off the top of my head: > > - - slightly more power > - - slightly slimmer size (same height and thickness, but 10% > slimmer in > width) > - - easier user interface with dial controls rather than +/- > pushbuttons > - - 1/3 f-stop increment control possible > - - single button to allow both tilt and swivel (550 has > separate buttons for tilt and swivel) > - - 180 swivel both directions (550 only allows 90 degree to > the right) > > About the only marginal advantage the 550 "might" have is > when I used the 550 and 580 with an ST-E2 IR controller, it > seems the 580 was just a hint less sensitive to the control > signals beamed out from the ST-E2, but this could easily be > how the signal is bounced around in this fairly large set, > the flashes were placed a bit behind my and each flash was > good 10 feet either side of me, I eventually solved the > problem by rotating the sensor head of the flash to the ST-E2 > but swivel the head towards the reflector umbrella. > > - > -------------------------------------------------------------- > ---------- > - ----------------- > Add to these: > 580EX recognizes camera sensor size and will shift the > zoom according.=20 > Example, on a 20D a 50mm with 1.6x focal factor > is an 80mm, the 580EX will zoom to 75 or so to compensate.=20 > 580EX has 14 custom functions compared to 6 for the 550EX.=20 > 580EX is also slightly lighter and slightly more > powerful GN at the tele end.=20 > 580EDX is 25% fast > 580EX has flash coverage as wide as 14mm compared to > 17mm on the 550EX.=20 > 580EX has 25 manual power settings; 550EX has 8. > > Peter K
Not to mention that the 580ex supports ETTL II, which incorporates distance into the flash exposure calculations. Paul Wasserman * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
