Canon 550EX in manual mode can't trigger an optical slave?

Started Mar 7, 2013 | Discussions thread
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jeffinvan
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Canon 550EX in manual mode can't trigger an optical slave?
Mar 7, 2013

Hoping someone might point me in the right direction; I've got:

  • Pentax K-5 with a wireless Cactus V5 trigger, wireless flash mode disabled
  • Canon 550EX in manual mode on another Cactus V5 trigger
  • Metz 48 AF-1 (Pentax) in set to SL(M) (otherwise known as dumb optical slave mode)

Under the following conditions, the Metz will fire:

  • firing K-5 on-board flash will trigger the Metz optical slave
  • firing a P&S Nikon on-board flash will trigger the Metz optical slave
  • firing the Canon 550EX on/off trigger (using the flash test button) will NOT trigger the Metz

Conclusion would leave me to believe that something might be wrong with the Canon?
Any help is appreciated.

 jeffinvan's gear list:jeffinvan's gear list
Pentax K-5 Panasonic Lumix DMC-G6 Panasonic Lumix G 20mm F1.7 ASPH Pentax smc DA 16-45mm F4 ED AL Pentax smc DA* 50-135mm F2.8 ED (IF) SDM +7 more
Pentax K-5
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