Large gigantic open window behind head table....

Oh boy. Shooting a wedding tomorrow and there is a large window behind the head table. It is south facing and will be 6pm, so plenty of light left.

I have 2 speedlights and stands... Is this the best option?

Your two options are to add light (radio slaved flash) or expose for the subjects. Exposing for the subjects will give you terrible contrast, so adding light is the best option. You may need the speedlights pointed direct, not bounced or diffused. Use the shortest shutter speed your camera can manage - 1/250th or 1/200th depending on your camera.

Thanks for the advice Tim,
I think my max speed sync is 1/320 (400D).
I have cybersyncs but I am terrified about them because the last two shoots I have brought them, they have quit half way through. Bringing a 25 foot TTL cord as well just in case.
Don't have a ton of experience with the flash yet so hopefully I can pull it together.

your max sync speed is 1/200. The likely max sync speed when using triggers will be 1/125 or 1/160.

Depending on whats the other side of the window or even how clean the window is it may be better to just meter the people and blow the background rather than light them up ..... but I would probably do a combo of both, some flashed some blown background.

Well how'd it go?

It went really well. I set up my light stands and didn't even bother using them. It was still fairly light outside but not complete day light so I just used my 430ex on camera bounced.

Ended up working something like this:

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That's not too bad. The light would've given you better contrast and maybe some detail of what's outside, though sometimes that's not what you want to see.

Yes, that may have been better as there was a view of the lake outside.
Need to figure this lighting thing out more!

shoot on higher speed shooter 1/250s or higher if possible use flash bounced if possible and dont go to high on ISO.

mariusz wrote in post #8516070
shoot on higher speed shooter 1/250s or higher if possible use flash bounced if possible and dont go to high on ISO.

ie expose for the background, flash to fill the foreground, like any situation where the background is brighter than the subject. Bounced flash doesn't always have enough power, I often use off camera direct flash in these situations.

potn_momma2 wrote in post #8515517
Yes, that may have been better as there was a view of the lake outside.
Need to figure this lighting thing out more!

Yeah, you really do, it's incredibly simple.

Tim you should come to Canada and teach a seminar.

I can get the exposure for the background right, you throw in one flash and I'm ok, but fall apart with two. Wish they had school for these things!

potn_momma2 wrote in post #8520269
Tim you should come to Canada and teach a seminar.

Where in Canada are you?

Calgary, Alberta

potn_momma2 wrote in post #8520269
Tim you should come to Canada and teach a seminar.

I can get the exposure for the background right, you throw in one flash and I'm ok, but fall apart with two. Wish they had school for these things!

Thanks, but it wouldn't make sense to travel internationally to teach the basics when any number of people could teach them. Or books. Or just playing around.