 Bob Federer |
Using External Strobes with Canon 20D I have a couple of basic strobes. I use one with a soft box and the other with an umbrella. I have a PC cable running to one of strobes from the camera and the other strobe is set to "Slave" and reacts to the flash. I'm using a Canon 20D. It sends a signal to the tethered strobe only when the on-camera flash is engaged, so in effect, all three flashes are firing when taking the shot. I'm trying to figure out the optimum way to use the combination so that camera's pop-up flash doesn't dominate. I've read that since the strobes are expecting 1/125 sec settings, that I should be in manual, set the shutter to 1/125 or slower and experiment with aperature and strobe strengths. Is that my best route or is there a better way to determine what will work best?
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Jon Close |
Bob, I'm confused - how do you have a PC sync cord connected that is triggered by the built-in flash? The PC cord adapters I'm familiar with fit in the camera's hotshoe and prevent the onboard flash from popping up. The 20D's built-in flash functions in E-TTL with a pre-flash. The pre-flash usually trips optical slaves too soon, before the shutter opens.
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Jon Close |
D'oh, nevermind the first part. I forgot that the 20D has it's own PC sync terminal. The 2nd part still applies however, the E-TTL built-in flash will trigger an optical slave too soon. You can't set the built-in flash output directly, but you can adjust it so that it is not the main flash light by applying negative flash exposure compensation. If you can, you should connect both the remote stobes via PC cord. Otherwise, you may be able to position/shield the optical slave receptor so that it doesn't "see" the 20D's built-in flash and reacts only to the PC-connected strobe.
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Joe Jarosz |
Hi Bob, which strobes do you have? Many of them have built in ability to slave off of each other and not use the on board flash at all. I also use the 20D and use a sync cord to the first strobe, then the second strobe optical triggers off of the first. Joe
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Bob Federer |
Im using AURORA CAMRAY C150 strobes. I've been looking around on various forums, and it seems a possible answer to my problem (which includes the e-ttl situation) would be this: Use my 580EX speedlight on the camera instead of the pop-up. Set the speedlight to manual and lower the flash output so that it will act as fill only. At the same time, I might as well turn the wirless switch to off and turn on the high speed sync (allows any shutter speed to be used).
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Jon Close |
That all sounds good, except for turning on high speed sync. The 580EX can sync at any shutter speed, but your other strobes require a shutter speed of 1/125 and longer.
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