To address the first problem, I use several strobes positioned around the dance floor on tripods with wireless controllers. On my camera, I have a wireless controller. Which talks to each off the three strobes postponed around the dance floor. The controller allows me to adjust the power (brightness) of each strobe. Each strobe is identified with the letters A, B, or C, which correspond to the settings on the remote control. By using this method and technology, I produce the types of images that you see above. This technique also works well in tented weddings.
I have learned (the hard way) to use less expensive strobes in this situation because occasionally, under the influence of too much party juice, that a tripod can be knocked over – I do use sandbags to actor them, but they cannot combat a 200lm man, as he falls over.
To address the second problem of focusing in the dark, I use a small LED video light mounted to my camera. It is a focusing light. It projects light on my subject, my camera focuses very quickly, and then I can press the shutter which activates the three remote strobes.
Together, this technique and supporting technology allows the fun of a wedding reception to be fully documented.