Fall, Oulanka NP, Finland. Photo by @peteressick. This is the time of year to photograph mist on rivers and lakes in your nature photos. The mist is caused when the air temperature becomes colder than the water temperature. I have found about a 20 degree difference makes for a lot of mist, and the larger the difference the more mist. The early mornings are obviously the best time to photograph, as the air temperature is at its coolest before the sun rises and "burns off" the mist. by natgeo

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