Just to make sure we're on the same page and I don't look like an idiot, is the sentence in your follow up from the poem by Elizabeth Barrett Browning?
How well a camera focuses in low light depends a lot on the camera. In low light I use a Canon 6D and it can focus better in lower light conditions than my 7D can and also it produces better images at high ISO's. Having said that I eventually had to resort to manual focus in the dark on a recent visit to the Singapore Night Safari, which wasn't very successful.
