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Thread started 14 Aug 2012 (Tuesday) 18:21
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HELP. 20D and55oEX Speedlight not communicating

 
Chiaroscuro ­ Photography
Hatchling
4 posts
Joined Jun 2012
Location: WI, USA
     
Aug 14, 2012 18:21 |  #1

First, my contacts are clean, but theres a problem with communication. In ETTL mode on flash the zoom isnt working regularly, and often in low light (aperture priority mode on cam) the camera seems to meter for available light instead of acknowledging flash will fire. I end up with either underexposure or trails from cam shake. Also, last 2 shots I took the camera showed "error 99" and shut down.

I have a wedding to shoot on Sat.




  
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oldvultureface
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Aug 14, 2012 19:18 |  #2

Chiaroscuro Photography wrote in post #14858998 (external link)
... and often in low light (aperture priority mode on cam) the camera seems to meter for available light instead of acknowledging flash will fire.

That's the way Av mode works with E-TTL. The camera meters for ambient and the flash tries to expose for a nearby subject (think night portrait with a cityscape in the background).

Make sure your flash batteries are good. Weak batteries mean erratic behavior.




  
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Chiaroscuro ­ Photography
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Hatchling
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Joined Jun 2012
Location: WI, USA
     
Aug 14, 2012 19:46 |  #3

Thanx. I'll replace the batteries right away




  
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HELP. 20D and55oEX Speedlight not communicating
FORUMS Cameras, Lenses & Accessories Canon Digital Cameras 
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