There are a few key points you'll want to consider when looking for a camera that produces killer images in less-than-ideal lighting. The first is the amount of light that the lens can capture. The technical term is aperture, but you'll also hear it referred to as an f-stop , or sometimes as the speed of the lens. The lower the number, the more light the camera can capture. Some compacts open up all the way to f/1.4, which is a heck of a lot of light. Because the scale is based on the diameter of a circle, the numbers progress based on the square root of 2. For those without math degrees, an f/1.4 captures twice the light as an f/2 lens, which captures twice the light as an f/2.8 lens, and so on. But you can't pay attention to just one number. Take a look at the Sony RX100 II, with its 28-100mm f/1.8-4.9 lens. At its widest angle it captures an impressive amount of light, but as you zoom in the amount of light captured decreases. This is typical of most comp
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