I didn't notice that my lens had fogged up which is why the second picture has that diffused, gaussian blur look to it at the edges. The center of the lens had already cleared up, but the sides still had some fog left. It's a good thing I had my lens filter on! I don't know if I would have risked cleaning the front element of my "L" lens with just a napkin.
Anyway, here's a lens cleaning tip that's pretty helpful if you absolutely have no choice but to use a napkin.
"Stop at the nearest bar, ask the bartender to moisten a clean, soft cocktail napkin with vodka, and proceed as if you had lens cleaning fluid and tissue." (Popular Photography & Imaging, January 2007)
