As you can see in examples with this article, fog can add a lot of mood to your photo. We’re in august now and in the coming weeks the chance on fog will rise. I’ll try to give some information and some tips on how you can use it in your photography.
What is fog?
Fog are small floating raindrops that float close the surface of the earth. Fog is actually a sort of low floating cloud. It limits your sight. How limited depends on the number of raindrops that are floating in the air. This limitation of vision can really help to disappear the not so beautiful things in your photo. Think of power lines, ugly buildings on the horizon, etc. Even if they don’t disappear completely, it looks very different when the base of these element disappears in the fog..
What types of fog are there?
There are different types of fog, which differ by the way they occur:
This form of fog depends on the supply and transport of air (advection). It occurs when warm air is blown over a cooler surface. That cooler surface can be water for instance (like the ocean, a ditch or a lake). Warm air is cooling off because of the cooler surface and the air temperature reaches its dewpoint. Unlike radiation fog, advective fog needs wind. So this is mostly present around water surfaces like ditches, lakes, and rivers.
When fog freezes on cold surfaces, we call it freezing fog. When it’s visible we call it hoarfrost
. This deposit of frozen water vapor forms on grass, leaves, thin twigs, fences, etc. When these circumstances occur longer it can grow to several centimeters big and results in spectacular photo opportunities! Certainly a condition to look for in winter time.
Rain fog occurs if the air above the ground is pretty cold and with rainfall warm air is fed down. The warm rain falls through the cold air and that causes fog. Unfortunately I don’t have an example of that.
Radiation fog is fog that is formed from the ground up by cooling of the ground. It needs a little bit of wind (more than 1 m/s) but not too much (less than 3 m/s). It adheres to cars, blades of grass, and trees. Mainly fog occurs on clear nights with a little wind. Examples of radiation fog are ground fog, fogs and fog in valleys.
One other power of fog that can’t be overrated is making (artificial) light more visible! Look at these two examples:
I hope this article helps you a little bit in seeing the opportunities fog is giving you in landscape photography. A good weather app that I use to spot foggy conditions is WheaterPro. This app is available for almost any mobile platform and the app that I personally use to estimate the upcoming weather conditions.
Source for this article: Weeronline.nl
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