This is a bit of a safety shot - inspired by my own efforts with the roses a few days back, I gave things a crack with the Sodial Extension Tube #1. Couldn't get the saturation all the way to true red without clouding a lot of detail, so I cheated and went for monochrome.
Pentax K-5 with FA50/1.4 @ f/22.
For a lens which really wasn't designed for macro duties and a cheap Chinese extension tube set, I think this is doing pretty well as a hand-held macro rig.