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10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 01:03 AM   #1 (permalink)
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How do I fix this?!

I want to trip the powerpack via my Canon 10D on-cam flash. So, I set the cam to "Manual". I dial-in cam according to light meter. I cover the flash with some exposed E-6 processed film to take out the visible light, but still trip the powerpack. This works.

The PROBLEM is that my photos are totally black! After some testing, I've concluded, its the 10D "knowing" the flash is up, and calculating/altering the results...even though the cam is on Manual! How do I fix this?!

Thanks,
Adam
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 01:39 AM   #2 (permalink)
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Can't help on the canon part
BUT ... make sure its on FULL manual
DON'T have the shutter over 1/125 or so

Probable check to see if the 10d uses somekind of "PRE-flash"
that would set off the studiolights BEFORE the shutter opens up

hope this helped
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 01:48 AM   #3 (permalink)
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Exactly -- the pre-flash is tripping the strobes before the shutter is open. Not sure if there is a way to disable this -- the preflash is used to get the ETTL info.
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 02:03 AM   #4 (permalink)
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doesnt seem to be a way to disable it ( read some stuff on FM Forum )

but you could try more E6 film on the flash (the pre-flash is weaker)
ALSO move the powerpack as far away as possible

OR you need to look for a slave unit that will ignore the preflash( wein ?)
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 09:04 AM   #5 (permalink)
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I think the red-eye feature fires the flash prematurely. Make sure it's off.
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 11:47 AM   #6 (permalink)
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If the powerpack you are refering to is similar to a strobe then you can try this.

Meter the shot seperately without the Camera's metering system so that you aren't metering it through the camera which is reading the shot with it's own flash being up. Also shut off the red eye feature and shoot on manual as you have done already to keep any pre lights from coming on the camera. Then trigger the other light with your camera flash as you were doing. Your other option would be to have a infra red triggering setup with sending unit and receiver.

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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 06:45 PM   #7 (permalink)
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I do this all the time with my Canon. Just make sure that the flash is on manual also. I don't even bother with the E6 cover. I just set the manual setting somewhere in the neighborhood of 1/64 and point it straight up at the ceiling or in the direction of the pack's optical trigger. The balance is finding the lowest setting that will reliably trigger your pack but will not adversely affect your lighting setup. Or if I actually want a little fill from the camera direction then I set the power accordingly and let it fire towards the model. This will also give you a nice catchlight in the eye no matter where your other lights are.
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 11:55 PM   #8 (permalink)
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Thanks for the heads-up...

-Adam
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 11:56 PM   #9 (permalink)
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Thanks for looking into this, Stan.

-Adam
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Re: 10D; tripping Powerpack via on-cam Flash w/ E6 film
Old 11-06-2005, 11:58 PM   #10 (permalink)
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Thanks Sean. Doesn't seem to be a way to turn it off, but I'll check into it.

-Adam
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