Ah, in which case… great review! 
The SBT90.2 would be interesting in a zoomie, and i prefer a 2mm white flat in my Cometa to the 1mm, the 2mm seems to work better with the lens but i don’t know why and haven’t got round to raising a thread on it yet.
Also, the Z1’s SST40 is crying out to be sliced! Listen…