Embrace the light
Not only does fog reduce visibility, it also reduces contrast by acting as a giant softbox and softening the light.
This means that colours are less intense and subjects less clearly defined, but rather than seeing this as a problem, use the conditions to your advantage and shoot subjects that respond well to this treatment.
There is a subtle but beautiful quality to pictures of fog, which produce muted colours and a monochromatic feel.
Incorporate strong shapes into your pictures and use the foggy conditions to disguise distracting backgrounds and create simple but effective compositions.
The overall light tone of mist and fog can cause problems with exposure, leading to pictures that are too dark. This is easily overcome by applying Exposure Compensation to allow more light onto the sensor.
A good way to get this right is to make use of your camera’s histogram, which is a visual representation of the brightness levels within the shot. The aim when shooting mist and fog is to use exposure settings that push the histogram over to the right-hand side, but without blowing the highlights.
Above all, become a weather watcher, and the next time mist or fog is predicted, immerse yourself in it to create images with a magical feel.