The most common and descriptive name for a "macro filter" is "closeup lens". I have a Canon 500D (pricy as hell), and it really limits the maximum focus distance of any lens. On my 24/105 at a FL of 105 mm, the maximum focus distance is about three feet; at 24 mm, it's about eight feet. Obviously neither are anywhere near infinity.
Regarding the UV filter; if it's high quality, then it will seldom cause problems (seldom, not never). The B+W filters are high quality (as are another German brand - Rodenstock - I have two of each).
I also hope you are using the lens hood - always. A little bit of light on a UV filter (particularly a cheap one), or light on the lens, and you'll encounter lens flare.
It's a pretty decent one and I don't use a hood, should I get one?


- except for the guys' faces.


