Is this a weed?

These tiny flowers grow in our lawn which I suppose makes them weeds, but when you get up close they are really pretty.  I guess a weed is just a flower growing in the wrong place.

Experimenting with an achromatic lens and dioptre filters on my widest angle lens today.  Wondered if it would be easier than the extension tubes as you just have to screw them on like any other filter.

The dioptre filters worked great, not so sure about the achromatic lens though.  It is fine at the narrower end (25-42mm) but at the wider end (14-18mm) it gave some very strange results.

I'll have to try it with my telephoto lens next.  If it doesn't work any better with that, its going back!