Why doesn't somebody over at Fred Miranda mention the Fotodiox solution. There is no limitation to tilt and or shift. I am not a member there so can't.
As for an expensive never arriving Lee "solution" with limited usability, it is a joke. Go on Amazon and just buy a ready made high quality solution, I just did and the Fotodiox Wonderpana just works.
privatebydesign would you have sample images of the fotodiox setup on your 17mm at max -12/+12 shift? at f/8 and/or f/16? I am curious to see if there is any vignetting with the fotodiox setup+filter attached.
I am also curious to your opinion on the fotodiox 145mm filters in particular the full ND as there aren't many reviews on it. Comparing prices on Amazon I see a regular photodiox nd8 for $80 and a Lee ProGlass 0.9 for $180! Almost 2x the price, not sure if there is a significant difference in quality between the two brands?
Sorry it took so long to follow up on this.
First image is an overlay five shot (not blend) with the Fotodiox Wonderpana and CPL in place, shot on 1Ds MkIII TS-E 17 @ f16. Unshifted is the red rectangle and the four ears are 12mm shift in each direction. The shadowing on the extreme corners is the effect of the light falloff, not vignetting, it is apparent in the set I took without the Wonderpana in place as well, the second image.
Even reverse tilt can be used at 12mm shift up to about 4º, or if you need the 6º tilt then 8mm shift is where you start to get vignetting. But these are very extreme uses, with 4º of tilt you are looking at a J point less than 12" below the camera.
All in all I am very happy with the performance of the Wonderpana and I wish somebody would post about it on Fred Miranda board.