19 December 2008

EZ Speedlites and EOS DSLRs

Does it work? In three words, yes and no.

A Canon digital EOS SLR will fire an EZ Speedlite. But, there's no automatic metering so you'll need to go back to measuring subject distance and aperture and setting the flash power manually. If this is you, then here's some formulae that may help:

Guide Number/Aperture = Range

Guide Number/Range = Aperture

Aperture x Range = Guide Number

And if you want to know the Guide Number of your Canon flash, look at the first two numbers in the model name. 580EX II = GN of 58. 540EZ = GN of 54. MR-14EX = GN of 14.


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