I managed to get a i1pro (EFI ES-1000) for 36 pounds!!! WTF!
It was apparently dropped and untested, and the UV cut filter is smashed (good for me, actually).
However I can confirm the wavelength scale is still very accurately calibrated. Tested with fluorescent lamp and HeNe laser. So I got a steal.
So lens measurements are also incoming.
First tests:
Takumar lenses have interesting coatings, with a more flat transmission spectrum than modern lenses (I think), so the results always look magenta using standard matrices.