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Can you describe the studio flash- Does it have a synch lead connector or a built in slave sensor. I have a Canon EOS 500 and 600 and use either an infra-red trigger which sits in the hot shoe and fires the slaves on my studio units but I can also use a synch lead which plugs in to the back of one unit and the other end fits an adaptor which sits in the hot shoe -this latter adaptor is necesary as the cameras do not have a pc terminal and I suspect the EOS 3 doesnt either . What I do then is set the camera to "manual" and check the required exposure using a flash meter . Both my studio units have slaves so when one fires so does the other . This system works well . Stuart
Its called a studio flash, but it has a hot shoe for direct fitting to a camera. The hot shoe has a centre pin and four slightly smaller pins grouped together in a square. The bottom of the hot shoe connection has two symbols, an "F" and a "C". There is no other connector.
>Regardless of whethe or not it operates ON the camera and I would be wary >of connecting it via the hot shoe ,but you could try it. > I would imagine that,if it did fire in synch with the camera,you would > only be able to use it on a manual camera setting and by virtue of the > fact that it is fitted to the camera in the worst position for studio > work the results may be disappointing .You can only try it 'tho and see > what happens .
The alternative is to get an adaptor that it will sit in and another that sits in the camera hot shoe -both these must have a pc connector . Then get a pc cable and connect the camera and the flash together .that would allow you to move the flash around and get better results . If you are in the UK then Jessops will have the adaptors and cable. Stuart