godfrey, no uv, no cap, just hood, walking around the city all day no problem?
Correct. Been doing that with most of my cameras for thirty years or more now.
Here's me walking in Manhattan on a rainy day in May, carrying the GXR ... I only put the lens cap on when it was raining that day. Or I stuffed it under my vest .. !
(Using the GXR, I cap the lens module I'm not using when it goes in the bag because the 50mm's retractable hood retracts, the 28mm's hood is pretty shallow. This leaves the lens front element pretty close to the edge of the lens, so a cap to keep it from kissing other things in the bag is a sensible precaution. While the camera is around my neck, whatever lens is on it stays uncapped and ready to shoot with. Similarly, I'll cap SLR or M lenses going into the bag when it makes sense to do so because of the nature of their front element's exposure to the rest of the contents of the bag ... but usually a fixed hood precludes having to do that, I just drop the lens into a pocket in the bag, hood down, and put a back cap on it.)
Once upon a time I used UV filters for protection ... They never protected anything and did cause some image degradation from time to time. Also, I noticed that a very fine silty dust built up inside the filter/front element chamber, meaning I had to clean both the filter and the lens more often. I just stopped using them. My lenses stay pretty clean, much cleaner then when I fit filters to them in general. Most of what settles on the lens just blows away with the hand bulb blower.