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2 flash setup advice

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alexturton:
Hi

I've been dabbling in a 2 flash setup using pixel king flash triggers a canon 580 ex ii and 430ex ii.

My question is when I set it to 1 group ettl. Wil both flashes fire equal power even though the 580 is more powerful? 

Similarly when using ratios, do I have to adjust my ratio myself to account for the 580 being stronger? 

Many thanks.
Alex

digital paradise:
Technically ETTL is supposed to compensate so if one flash is more powerful so it should balance out. You won't be adjusting ratios because of that. You will want some difference between you key and fill lights. 

That said it is ETTL. A great tool but is subject to many variables. There is a pre flash that determines correct flash exposure. Much like your camera's light meter (NOTE: The cameras light meter has nothing to do with the flash) a bride in a white dress, a groom in a black tux and the bride and groom will all reflect light back differently. Typically the white dress will underexpose and the tux will overexpose.

What are your plans? Studio work? If so and if you have the time to set up I highly recommend setting your flashes on manual. Work on one flash at a time. Set the correct exposure for your key flash and then your fill can be 1 to 2 stops less power for starters. Once you set your exposures they will be consistent all day no matter who is in the frame. Also if you are doing studio I suggest a third flash for rim or highlight. Placed behind and to the side it highlights the hair on the back of the head, etc and gives some separation. You can a cheap manual Yongnuo for that.

So if you can describe what you will be doing we might be able to give you more tips.         

AdamJ:

--- Quote from: digital paradise on February 25, 2013, 10:16:33 AM ---That said it is ETTL. A great tool but is subject to many variables. There is a pre flash that determines correct flash exposure. Much like your camera's light meter (NOTE: The cameras light meter has nothing to do with the flash).

--- End quote ---

I'm not sure what your intended meaning was but for the sake of clarity, E-TTL II does use the camera's metering system. The 580EX II has an external meter which can be optionally used instead of E-TTL II but it has few if any practical advantages other than allowing automatic flash exposure off-camera when using dumb (non-E-TTL II) triggers.

alexturton:

--- Quote from: digital paradise on February 25, 2013, 10:16:33 AM ---
What are your plans? Studio work? If so and if you have the time to set up I highly recommend setting your flashes on manual. Work on one flash at a time. Set the correct exposure for your key flash and then your fill can be 1 to 2 stops less power for starters. Once you set your exposures they will be consistent all day no matter who is in the frame. Also if you are doing studio I suggest a third flash for rim or highlight. Placed behind and to the side it highlights the hair on the back of the head, etc and gives some separation. You can a cheap manual Yongnuo for that.

So if you can describe what you will be doing we might be able to give you more tips.       

--- End quote ---

To be honest I just do some stay are home indoor projects for rainy day. I got some flash triggers for my birthday and trying to get to grips with using multiflash lighting to create interesting effects.

Thanks for the notes on ETTL.

In manual mode, am I correct in thinking 1/32 on 430exII will not be the same power as 1/32 on 580exii?

digital paradise:

--- Quote from: AdamJ on February 25, 2013, 07:26:59 PM ---
--- Quote from: digital paradise on February 25, 2013, 10:16:33 AM ---That said it is ETTL. A great tool but is subject to many variables. There is a pre flash that determines correct flash exposure. Much like your camera's light meter (NOTE: The cameras light meter has nothing to do with the flash).

--- End quote ---

I'm not sure what your intended meaning was but for the sake of clarity, E-TTL II does use the camera's metering system. The 580EX II has an external meter which can be optionally used instead of E-TTL II but it has few if any practical advantages other than allowing automatic flash exposure off-camera when using dumb (non-E-TTL II) triggers.

--- End quote ---


I said the flash system does not use the cameras light meter. It meters ambient only. The flash system does use ETTL but for flash exposure purposes only.

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