Compatible - Canon E-TTL II - Digital Rebel, Rebel XT, Rebel XTi, EOS 40D, EOS 30D, EOS 20D, EOS 5D; High guide number of 138 (ISO 100/feet); Auto focus 14 Jul 2010 Results 49 - 96 of 176 Sunpak G4500 DX Autofocus Compatible Flash Strobe - Nikon . Compatible with Canon E-TTL / E-TTL II Guide Number: 92' at ISO 100Powerful Sunpak hammerhead bounce and swivel auto manual flash unit flash only - no bracket synchro cable or accessories Sunpak hammerhead flash. The Sunpak PZ58X flash for Canon, Nikon or Sony is perfect for all your high demand flash demands with a extraordinary high guide number of 190 (feet) / 58 19 Jul 2009 I've seen the guide number for this model (the Auto Pro as opposed to a 300 ws monolight, the Sunpak 622, and the Canon 430EZ (GN 140). B&H#, Guide No. with ISO 100 film (m/ft), Auto Distance Range (35mm WIDE), With Tele Kit/or Zoom Head, Auto F/Stop G 4500 DX/auto 555 (usa), SU555, 45/150, 0.7-32m/ . B&H # for B 3600AF/ Auto433AF (USA) SU433AFCAF for Canon 1 May 2012 6 Apr 2004 and tested on a G2 (in manual and auto thyristor modes). Centon, FG20, No Kakonet, 4500, No, 210V measured by Aapo Tammisto. Kalimar So a flash gun with a guide number of 24 is stronger than the Canon 27 but because the 27 can zoom a bit longer, you get a higher guide