I just spent a lovely day visiting Nokogiriyama ("Sawtooth Mountain") in Chiba learning why it is very important to check your camera before you take it out. I've had an indestructible smudge on my polarization filter for about a year, but since it never affected my shots, I let it go. This week I decided to buckle down and snag a new filter, but went for a UV filter to see what the difference was.
The difference, I discovered, is that UV filters make your blue skies look like they're made of neon goo. The weather was lovely, and every sky shot turned out like junk. However, I also learned that a UV filter will give you some decent shots in low light since it doesn't halve your light intake like the polarization filter.
Damn. The skies looked really nice today, too.
The waterspots on the sunset shots are fun—there was 40-knot gale smacking me in the face.