Hi
What a great idea with this forum!
I have been looking for a macrolens for B4 mount. I have found this one from Fujinon: MAF10BMD. It seems that this has a 2/3 bayonet but does it fit Sony's B4 2/3 mount.
Today I use a standard lens with a sneider macro lens mounted but I hope that a real Macro lens would give another kind of picture.