Most of the testing I did with the Fotoman 45PS was with the 75mm f4.5 Grandagon N. I didn't test wider for both the reasons David mentions and the fact that I doubt many folks who would consider a Fotoman purchase own or would buy lenses wider than 75mm for any other use.
The camera also works fine with a 135mm lens, or anything in between 75 and 135 but, of course, the longer you get the mor eprecise you need to be with your zone focusing. Go for the 75mm. Here is an 'environmental portrait' taken with the Fotoman 45PS on Polaroid film handheld using the 75mm. This image is in the artilce on the camera.
Just for fun .... who can identify the subjects? Hint, both forum members.