About ten minutes into photographing Dettifoss, the thickest fog I have ever experienced in my life spread over me, rushing from north to south. Almost immediately, the sky was blotted out, the landscape turned gray, and I found myself quite alone. The other dozen or so visitors scampered back to the parking lot, leaving me basically alone with the waterfalls, rocks and fog.
This suffocating fog was a bit of a bummer, given that the evening had been perfectly suitable for photography up to that point. But I'm not a person to bemoan things I can't change, so I decided to see what I could do.
Dettifoss is just one in a chain of waterfalls on the river Jökulsá á Fjöllum; upstream less than a kilometer is Selfoss - and it is pictured here. Or, rather, its western edge is here.
The fog was so alarmingly thick that I could not actually see Selfoss, despite getting within a hundred meters of it. The whitish blur on the left side of the picture is where the main drop of the waterfall is. I couldn't get closer due to curtains of mist blowing off the falls (mist AND fog - what a rare treat!), so I spent 15 minutes in this spot, clicking away, trying different shutter speeds (this one was four seconds), and appreciating the awesome power of the roaring river beside me.
Turns out Rachel was back in the van, freaking out, fearing that I had gotten lost in the fog and plummeted to my death. The whole time, I was whistling and taking pictures. Imagine my surprise when I returned to find her practically weeping with joy that I had made it.