Question about Canon EOS 40D Digital Camera

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Remote Firing of Flash Units

I am trying to fire some remote flash units with my 40D however I cant fire them with the main camera flash or my Speedlight off..? Is it possible in settings to manage this on the camera..or do I need to use the remote cable that is supplied with the flash units..? Hope this makes sense...thanks Paul

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The EOS 40D does not have a transmitter built in. The remote flash units must be set to "Slave" and the on-camera external flash unit (eg Speedlite 580EX) or transmitter (ST-E2) set to "Master". Note that the Speedlite 430EX doesn't have the function to act as Master and you need a minimum or the 580EX or a ST-E2 speedlite transmitter (or similar) as Master/s.

Posted on Apr 16, 2010

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Some flash units have a remote sensor that will respond to the camera's flash. The a300 has a wireless mode for triggering such flashes. There are remote flash systems that include a radio transmitter that fits onto the camera's hot shoe and a receiver that the flash mounts onto. Some flash units have a jack so you can use a cord to connect the flash to the camera.

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I have a Canon EOS 40D camera. We are having problems with using an external flash. The pictures always come out extremely dark with the external flash. The flash seems to work fine, it flashes...


I don't know if this will help and this post is two months old. The camera store may be right that the synchronization is the issue which tends me to point a finger at the external flash. There are at least three different flash units that will flash when the picture is made but only one type will sync with the camera. A digital flash unit is different from a film flash so a Canon EX type is required to sync with Canon TTL or TTL II digital cameras. An EZ will flash but it's off a bit, so I can only assume that your Promaster and Canon flash units are for film cameras. Okay and another thing that could be throwing things off a bit is the camera may have been programed in Custom Functions to use "Second Curtain" or "Rear Curtain". Just seams to me if the built in flash works then it's the external units at fault.

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When the flash mode TTL. Then this situation can occur if the proximity is working with other studio flash light traps. Your work makes flash another flash while TTL metering. And when is your main flash another flash did not have time to recharge.

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If you want to sell this I would be interested.
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NO CORDS NEEDED THEN .
BERRIE SMITH CAMERA REPAIR
BBMW@BELLSOUTH.NET

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