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Czyli z 580ex II są jakieś problemy?!
za manualem:


SPECIAL NOTE: Some Canon flash models emit RF interference that can reduce the effective operating
range of many radio slaves, including the FlexTT5. Those models include: 430EX, 580EX, 580EX II and others. For those model flashes, please consider the mounting suggestions in the pictures above to optimize range. If using Canon’s off shoe cord OC-E3, consider adding a ferrite clamp on the cable near the flash to further increase range.
The Canon 430EX II performs dramatically better in this regard. It does not require special mounting consideration and yields greater range.