The Nikon 90SW is virtually identical in this respect to the Super-Angulon, the Rodenstock, and probably the Fuji SW. It need one and a half stops of center compensation. In fact, I use the Schneider 82mm CF with it and the results in terms of field illumination are virtually perfect (densitometer tested). With all CF's you need to stop down a ways. Any 75mm lens is going to have
much more significant falloff, so unless this effect is something you deliberately want in your images,
and particularly with chromes, a CF is pretty much essential. Just be aware of quality issues - best
to buy one specifically dedicated to that particular lens.