Excellent wee lens for macro photography, and good for portraits too. I can't go along with a previous reviewer who said he'd had trouble focussing in low light. Absolutely no problem with low light and my copy - spot on every time!
An expensive lens (at the price I paid), which is not helped by having to spend significany money on a lens hood.
All in all I'de strongly recommend this lens to anyone who's not planning to go FF.