Yes but Keith what is wide or even ultra wide, assuming 120 & the 6x17 format I'd guess the widest lens that would cover the format is probably a 58mm SA and to me that's not particularly wide in respect to the vertical dimension.

The flattening is really more about the distance and perspective rather than the choice of lens, I have a tendency to go in close which of course alters the perspective and apparent depth. Jim Noel is saying much the same

Ian