UV lens

[SCraig]

... Because of the minimal impact on the images many photographers use them to help protect the lens as well.

I would be one of those. And yes, I do use lens caps. Any time I'm not carrying my camera around. When I'm walking around in the woods I worry a lot less about something scratching my lenses when they have filters.

Just my way of doing things and since they are my lenses I can do that