Extend the exposure
Olly says... The first shots that Caroline took were quite dark. In this sort of situation, there are a few things you can do. One option is to open up the aperture, but this affects the depth of field and we really wanted the whole subject in focus. As we were using a tripod and a remote release, we were able to go longer with the exposure (i.e. slower with the shutter speed) to let in more light, instead of increasing the ISO to brighten things up, as Caroline is used to doing.