I totally agree with J -- 50mm is a versatile "walking around" focal length with good and relatively cheap macro options, but if you're doing greater-than-1:2 magnification (or want to splurge on your One True Macro Lens) you really want something 100mm-ish or greater.
And a tripod.
And a subject that doesn't move.
Or maybe a flash.
BTW, some 100mm-ish lenses (e.g. Kiron/Vivitar/Lester Dine 105 and Cosina/Voigtlander 125) are a bit too heavy for comfortable prolonged handheld use. At the moment I'm very tempted by the much ligher Pentax D-FA 100/2.8 and Tamron 90/2.8.
Last edited by troyz; 02-02-2009 at 10:02 PM.