Macro lovers, i want this lens.

[wez130]

canon MP-E 65mm, FROM 1X to 5X magnification, a bargain at the equivelent of around £450......

http://www.photo.net/equipment/canon/mp-e-65

 

[SDK^]

I've tried this lens out and anything over 2 or 3x life size it's REALLY hard to maintain focus and composition.
It's a very specialised lens and does require a Macro focus rail to be of any use.