Michael Fryd
Forum Pro
A monopod or IS will not help you if the subjects are moving. With a wide angle lens, I would expect subject movement to be more if an issue than camera movement....
I saw the location today, went around the rooms with my camera, stood in the centre and just did 360 degree burst mode so I knew what was where and I can go over them after. I also have top down diagrams of what the rooms will look like on the day. Including a few X marks where I can sit down and photograph the wedding or set up a tripod or monopod out of everyone's way with zero hassle; this would be especially true if I was using my 25mm lens which has no IS, but is a very fast lens.
I would not take on more work than you have already agreed to. Concentrate on getting the best photos you can, don't spread yourself too thin to get worse photos and poor audio/video.I would assume aperture priority would be the best mode for shots of the vows (with it being a GH3 I could buy a directional mic and take stills while recording the vows on said tripod/monopod) as I can control DOF and get a DOF preview by hitting a FN button, I can also autofocus, hold down the shutter button and then manual focus it into tack sharp images.
Have the bride ask her guests to bring their cell phones and encourage everyone to take photos and videos. If you miss anything, she should at least have a cell phone image of it.
As you are new at this, I suspect you may want to do a lot of "Spray and Pray". You take a whole lot of photos, and hopefully some of them turn out OK. I can easily see you going over 500 photos. I would bring at least two spare batteries if I were you, and enough memory cards to hold all the images....
Thankfully the GH3 comes with good features like being able to move the focus point using the touch screen while using the viewfinder and the batteries last for a good 500 shots, though I'll probably grab a spare.
Personally, I like large memory cards. I would rather have one 128GB card than 16 8GB cards. With multiple cards, you have more of an opportunity to lose, misplace, or overwrite a card. Other people prefer many smaller cards, on the theory that when a card fails, they don't lose as many images. (however with more cards, you are more likely to see a failure).
Some flashes have a limit on how many and how quickly you can shoot. Reach that limit and the flash overheats, or slows down. Read your manual to find the limits for your flash.For the Yonguno shoe flash I have two sets of rechargeable batteries (one; I think 1300mah and the other set 2000mah. They don't run down quickly even if I have the flash taking- If I want it off the stand then it has a little shoe that can be connected to a tripod or balance it on a flat surface, if they want an outdoor kiss (I informed them that kissing looks more photogenic if they rub noses but obviously this won't be the case on "you may now kiss the bride" but afterwords if they want a nice photo of them together.
Bouncing your flash off the ceiling uses more power. You will go through flash batteries faster than you expect. Bring spares.