Low Light AF lock

If you're camera is like mine, a pain to AF on subjects when there is low light around, then you can consider an LED infared torch.

The trick is this. While most DSLR sensors have a filter which prevents IR light from being recorded (check whether your camera has this filter by taking pictures of IR remotes firing) the focusing mechanism has no such filter.

The end result is that if you illuminate your subject with an IR torch, then the AF mechanism can see it, but the IR light doesn't get recorded in the final picture.

I'll let you know about my results when it finally reaches me, but in the mean time, here is an experiment I did a few years ago...