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Flash Guide Numbers Comparison

Comparison of the Flash Guide Numbers for the Canon 580ex2, Canon 430ex2, Nikon SB-600, Nikon SB-800 Listing specified values from manufacturer or best numbers obtained, in testing? Note: Guide numbers listed in Meters/Feet at ISO 100 with varying zoom settings.

Zoom	Canon 430ex2	Canon 580ex2	Nikon 600	Nikon 800	Canon 540EZ
14mm	11m/36ft	15m/49ft	~12m/40ft	-	-
24mm	25m/82ft	28m/92ft	~19m/64ft	-	28m/92ft
28mm	27m/89ft	30m/99ft	-	-	30m/99ft
35mm	31m/102ft	36m/118ft	30m/98ft	38m/125ft	36m/119ft
50mm	34m/112ft	42m/138ft	-	-	42m/139ft
70mm	37m/121ft	50m/164ft	-	-	46m/152ft
80mm	40m/131ft	53m/174ft	-	-	50m/165ft
105mm	43m/141ft	58m/190ft	-	56m/184ft	54m/178ft

Photonotes - flash notes - Canon’s guide numbers are in metres at ISO 100, 1 metre = 3.3 feet
Photonotes - Guide to Canon Speedlights and EOS - include GN in meters for 430/580
KenRockwell - SB600 vs SB800 - guide numbers MEASURED at 35mm in ft (-1/3 advertised?)
Nikon SB-800 Specs - 38 / 125 (at 35mm) to 56 / 184 (at 105mm)
PhotoNotes - 430 Specs - OLD 430
Canon - 430ex2 Specs and link to PDF manual
Canon - 580ex2 Specs and link to PDF manual
Canon - 540EZ Specs old and PDF manual