Trying for at least 1 hour to export any usable Z Pass. no luck

enable Z Buffer in OpenEXR does Result in a .exr with Image and Alpha, no Z Buffer.

Tried with/without "use Nodes".

Exporting Z Buffer to a separate OpenEXR gives Image with Z Buffer but probably no Z Distance Information. (Hooked up to Defocus Node looks similar as Camera Focus set to 0). not usable as well.

tried as well different combinations of Float Full/Half, Codecs

same in Blender r26461 and r28263M


thanks, bashi

btw, it would be great to be able to read/change Z Information (Focus) in Compositor. (differently than alter Z Image). Set Focus in Post makes so much more flexible as before Rendering. Re-Render to only set Focus Point to another Place? really? ;-) and sorry for placing this here.