As much as I'd like to take credit for some of the effects here, I can't take much. On the thumb trip a few weekends ago when the weather was quite warm for Michigan in May, there was fog on the lakes - even into the afternoon. The light itself is some distance off the shore and this is about as close as you can get without some sort of floating device. This is with the zoom at max (270 mm).
Focal length 270 mm (405 mm for 35mm film)