SO enter the new lightweight setup =) the GXR + A12 50mm macro module.
The GXR system needs no introduction to enthusiasts. And oh, about all the terrible things they've said about the A12 AF speed - its mainly true - its terribly slow... but i've never used AF for macro before so it makes no difference to me.
I just set the thing to MF, turn it to the min focusing distance, which gives 1:2 magnification.
My 8-legged friend dropped in to gimme a chance to test out the macro capabilities... some tweaking needed to improve the lighting but seriously, not bad at all...