I found out that my camera does not filter out infrared light, so all I have to do is put on an infrared filter and I can take infrared photography. So I took it out for a spin yesterday, and it was too bright out to check the preview on the LCD. When I got home I discovered that all of my subjects were out of focus. That's the first one of the kid, at Baker Beach. Turns out I needed to compensate for a focus shift with infrared. Today I tried to account for it by focusing at 2/3 to 3/4 of the distance to the subject, with moderate success. That's the second one of the tree, in Japantown. It's still very iffy, so bracketing a few for good measure will probably be the best way to go. As if I weren't slow enough with the manual focus....
