I got an idea about 6 months ago from reading the Minor White chapter in the Adam's Polaroid book that works very well and I've used it a lot since then. White was describing using polaroids to do portraits where the photographer would try to get the sitter to display a certain emotion or state of mind. Then they would try the same thing, but without using any words. They would also switch places during this process so that sitter became photographer and vice versa.
I took this idea and applied it to kids by letting them take pictures of one another using type 55 on my 4x5. The largest group I have done is a K-1 class at my daughter's school which was 16 kids and took awhile. I'll describe what I did then, but it is much easier with two or three siblings. First I have all of the kids pair up. Then we do one pair at a time. The others can go off and play or whatever. The first child sits down or stands and thinks about what pose to do. All I told them was to sit in the same spot and not move around too much (which doesn't always work). I then position and focus the camera, take the meter reading, etc. and let the other kid look at the gg under the darkcloth (they love this), let them dry run the shutter a couple of times (they love this), then load the film and tell them to stand by the lens and push the button when they are ready. I sometime tell the sitter to try and figure out what emotion/face the taker wants them to make, but this is often just unnecessary as they naturally figure it out themselves. I then process the type 55 and keep the negative, which I enlarge for the parents. Then we switch places and do it again.
I've gotten some of the most amazing expressions out of children. Or, I should say, they get the most amazing expressions out of each other. Stuff that I sometimes get myself, but they almost always get. It is quite amazing.
A couple of technical notes: a self-cocking shutter or a finicky shutter is a recipe for disaster unless the children are a little older as they tend to fire it like a machine gun given the opportunity. Also, I'm not sure that 3 year olds can do it. I've never tried. My 4 year old is fine, but that's him.
I give them the polaroid after coating it, but there is usually a lot of pollen and other crap blowing around which will all stick to the polaroid so beware.
I've had lots of problems with scratches on negatives putting them into the clearing tank with the slots. They slide around and hit one another no matter what I do. I think individual sandwich bags with a little water (or don't process the film there at all) are the way to go to insure no scratches. I had one negative badly scratched one time that turned out to be the kid's favorite picture eventually. When I enlarged it I took a toy godzilla (this guy loves Godzilla, but then doesn't everybody?) and positioned it over the scratches so that it appeared that Godzilla was in the picture with him. He couldn't figure out how I did it. Fun.
I meter at 40 or 45 and usually shoot pretty wide open as a result, but I just got an Imagon, so I'm going to try that. Though kids don't need the softness so much. But you have to keep the shutter speed up there because they move.
Best,
Will