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For those of you that work as a team, do you basically have double lenses at each focal range? Do you take turns switching off? Does one shoot primes and one stick with zooms? Are there just a couple lenses that are so integral that you have two of them, and the rest you switch off as needed?
Nope, we're not rich enough for that.

Like other people have posted, the three main lenses we use are the 70-200, 24-70 and 50. We honestly don't switch a whole lot because my S.O. likes just using the 24-70 and not going through the trouble of switching. He's one of those, "Don't fix it if it ain't broke" types. He does get jealous of the 70-200 now and then (one time he came home to find it in bed with me, and, well, let's just not go there). For our next wedding we're going to rent another 70-200 from LensProtoGo (only $100 for a week! awesome!) so he can keep it at his hip if he needs it.
As it stands now, usually I'm at the back of the ceremony (as in, far away from the altar) with the long lens while he stays on the peripherals up front, stepping in for two seconds when he needs to and then stepping back again. For formals, only one person shoots. The first half of the formals we do the traditional poses with parents, grandparents, etc. and he shoots that, and then we let them know they can leave and we start on more creative, artsy poses of just the bridal party (which I shoot).
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At the actual event, is one person more of the lead photographer, or are duties shared equally?
Oops, guess I kinda answered this a bit above. But if one person is leader, it's me. Big surprise, knowing my personality right? Seriously, if anything it's because I'm more outgoing than he is and I think women can give polite suggestions without people feeling so on-the-spot than men.
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And as far as post production goes, who does what? We have the biggest issue with post production. We both want to be the one processing, and we have yet to find a system that works with us.
Here's what works for us. I really LIKE doing PP and we both agree that I'm faster at it, anyway. So I do the PP and when there's a photo that I'm not sure we'd agree on, I bring it to his attention. This takes a little effort, because you have to be REALLY honest with yourself about how you think your partner would feel about it, which is harder than it sounds. You have to be able to put your ego in check so you aren't grabbing his attention for a photo that deep down you knew you'd both agree on anyway (wastes time) and you both have to be able to somewhat moderate your tastes so that you can find a happy medium. We try to keep the photos that one of us really doesn't like down below ten in the final gallery. Sometimes it helps to process the photo both ways and put both up there and let the client decide, too.
But like Matt said, I think for both people to review and process every single picture would just take too much time.
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Right now we are keeping all the images (backed up of course) on one computer, and it's his computer and set up the way he likes. I cannot stand working on this machine at all. He's got some goofy trackball that I can't stand, and he uses a mac and I'm much faster working on a PC and get WAY less frustrated. This is also a point of contention for us. Working from two different computers seems like it would be tedious and inefficient though. Any thoughts?
Set up a network!

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Any of you that have worked with your spouse/significant other and have any pearls of wisdom to share - please let us know!
The minute what you're doing starts to feel like drudgery, STOP. Take a break from the work, and from each other even. You'll work faster and better if you take a break for at least fifteen minutes and treat yourself to a snack, a walk, or a quickie in the shower.
I always try to employ the sage advice of a music teacher I had back in the day: always stop what you're doing before you're completely ready to, so that you end on a high note. You should finish work BEFORE you get to that point where you feel like you're starting to get burned out. That way, your fingers will be itching to get back to the computer later. Psychology is pretty simple in this respect...if the last time your brain remembers doing something it has a negative feeling of some kind attached to it, you are going to subconsciously condition yourself to feel reluctent, tired, or frustrated the next time you have to do get back up there.
Lastly, be honest with yourselves and look out for each other. I know you do that anyway, but try to be concious of the other person's weaknesses and strengths so that you can nurture each other and help each other become better photographers and business people. One of my weaknesses is that I get too wrapped up in the details...honestly it does NOT matter whether a picture looks just one shade warmer or whatever, and if I were doing this by myself I'd be clicking the "Preview Layer" button on and off all day. My S.O. is quick to tell me to stop being a noobcake and get the show on the road -- PICK ONE, it really doesn't matter. Coming from someone else, that might seem harsh, but because he's my S.O. he can say stuff like that without me taking it other than how it was truly meant instead of getting all huffy 'cause my poor little ego was bruised. I hope that makes sense. That's an advantage that couples have over aquaintences who work together, and you shouldn't hesitate to use it.
That's probably enough sermonizing from me for one day. I think I'm over quota this month, come to think of it.