Ah, here's a quote from Sam of LB on that thread that will give a bit more indo
"Unfortunately, at this time we can't make a Tilt Transformer for Nikon lenses to Nikon cameras. We can only make a Tilt Transformer for Nikon mount lenses to mirrorless cameras such as the Olympus and Panasonic Micro Four Thirds cameras or Sony NEX cameras. This is simply a matter of getting the proper spacing of the lens to the image sensor to allow focus to infinity even when the lens is tilted.
Picnic - sounds like a bit of a dilemma, but a nice one to have
The one caveat about the Composer with Tilt Transformer is that it is not compatible with the Fisheye Optic. Getting the Tilt Transformer by itself might be the
Dright choice, but the good news is that it is quite compact."
That solved that for me as I like to use the FE. I'll use the extra $100 to buy the FD adapter and toward a Nikon prime maybe.
Here's a bit more that explains their choice of Nikon lenses
"To clarify about the products we are introducing now, the Tilt Transformer works on Sony NEX and Micro Four Thirds cameras and allows Nikon lenses to be mounted and tilted up to 12 degrees (a lot more than a traditional tilt shift which, in the case of the Canon 17mm is only 6.5 degrees). If you have a Micro Four Thirds camera and a Nikon lens, all you need now is the Tilt Transformer to make them work together in super fun ways.
We developed the Tilt Transformer to work with Nikon F mount lenses because:
1. the backfocus distance of Nikon lenses is the longest of all the (35mm) SLR systems, allowing the most amount of tilt in our Tilt Transformer
2. Nikon lenses are known for their high quality
3. there are tons of Nikon lenses available in the F-mount, many great quality used ones for very cheap
4. out-of-date mounts like Minolta MD, Canon FD or screw mount are no longer available new, thus making the appeal of using these lenses on our system limited to a smaller audience
5. Canon, the only manufacturer with a current lens system that has as many or more lenses in the world than Nikon, uses an electronic aperture system, eliminating any possibility of controlling the aperture with our system. Users would be limited to shooting wide open if we were to use a Canon mount. "