Not to hijack your thread, Mike (and maybe you'll get some answers about the achromat)... but...
Are you married to getting a new Letus?
I ask because after five years we are retiring our P+S Technik Mini35, and are thinking of selling it. No disrespect to Letus which is a good enough product, but it's pretty well established that the P+S Technik is an infinitely better unit than the Letus or any other DoF adapter out there. In fact, it is probably the best-engineered and designed piece of optical equipment I've ever owned, period.
Ours cost us $11,000 when we bought it and it has been worth every penny... but we'd let it go for a song now, just because the secondary market for DoF converters is very low.
We retired it (we were using it with an XLH1) because we have moved to the C300 and just don't need it anymore. It sure has produced some incredible images for us though.
If interested, feel free to contact me off forum at todd(at)fantasticplastic.com
And if not, well, now back to your regularly-scheduled posts...
Fantastic Plastic Entertainment, Inc. fantasticplastic.com