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| Without filter | With Fog A filter | With Fog B |
| Click on the icon to see a larger image | ||
Fog filters are the easiest to use, because they simply create a foggy effect! Fog filters have different density values. In general, the higher the value, the thicker the fog. For example, Tiffen has Fog 1 and Fog 3 filters, while Hoya has Fog A and Fog B. In Tiffen's (resp., Hoya's) case, Fog 3 (resp., Fog B) is denser than Fog 1 (resp., Fog A).
In the following images, the left one was taken without a fog filter; the second one was taken with Hoya's Fog A; and the right one was taken with Hoya's Fog B. It is easy to see that the fog effect of the right image is stronger than that of the middle one.
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| Without filter | With Fog A filter | With Fog B |
| Click on the icon to see a larger image | ||
Fog filters can also be stacked together to create even stronger effect. The following image shows the result of using both Fog A and Fog B filters. Of course, two Fog A's will create a lighter effect, while two Fog B's will have a stronger effect.
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| With Fog A and Fog B filters |
| Click on the icon to see a larger image |
Because of a soft-focus effect over the entire image, fog filters can also be used in portrait shots. However, please keep in mind that aperture should not be too small because smaller apertures tend to reduce the foggy effect. Moreover, longer focal lengths emphasize the foggy effect. Check the LCD monitor for the best result. In general, a uniformly illuminated scene would deliver better results. Look at the following image. Do you see anything unusual? You would not see shadows in a foggy day!
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| Click on the icon to see a larger image |