Fog is an addictive weather condition for photographers. Once we've experimented with it, we all fall in love with it: the way it softens and adds a glow to the ambient or artificial lighting, the bursts of light rays it causes when the sun breaks through it in a woodland, the palpable mystery it contributes to an otherwise normal or mundane scene.
Random and ephemeral, fog gives us momentary opportunities to make something compelling of pretty much anything.
A word of caution though - it's all too easy to think that, just because it's foggy outside, the conditions are routinely going to produce something worthy. In much the same way as a new lens will change the way images look, we can't expect the casual shots we fire off to test it to be amazing just because of quality or cost of the lens...
We still have to apply our knowledge of composition, exposure and light to produce fog images that deserve a second glance.