Couples portrait shot w/ 24-70L - what setting to use?

As much as I want to do a "studio" shoot, I don't have the lighting equipment for this... any suggestions on the settings if we do the shoot outdoors?

let's say overcast...

i'll be using a 7D with a 24-70 lens and a 580exii for fill flash...

any suggestions?

Though I would not be confident doing a shoot without having a strong idea of what to do, here's my advice:

Find shade, set your camera to manual mode, set your shutter to 1/250, ISO to 100, set your aperture to underexpose the background a stop or two, and use your 580exII on eTTL mode with 0 FEC.

That should be a good starting point. Good luck with the shoot.

You have a 7d, take the flash off the camera, get a cheap light stand, move the flash to one side then do as above suggested.

thanks both...

I'll try both your suggestions...

If you're not really familiar with off camera flash, don't waste time "working it out" on a live shoot.

Just go with a high enough ISO to shoot around f4 at 1/250th. Don't push the lens to f2.8, but stay this side of f8.

Keep the background a good distance away (for nicer bokeh), "fill the frame" with your subject (i.e. shoot tighter, chest up), focus point on the eyes, and use your time to improve the posing and facial expressions.

The next investment you need to make is a large collapsible scrim (and a friend or family member to hold it) so you don't have to wait for an overcast day.

JMHO...