Understanding focal ratios

ONE OF THE MOST FUNDAMENTAL

principles of photography is that the more light you collect, the less image noise you’ll have. This is especially relevant when it comes to photographing the night sky, in which a good signal-to-noise ratio is vital for pleasing results. The bottom line is simple: More light (‘signal’) is good.

You may think that boosting your camera’s ISO setting is an easy way improve the situation, but doing so only makes the image appear brighter and does nothing to increase the amount of recorded signal. This is not the solution you are looking for.

Let there be light

There are a number