One of these should be arriving sometime over the next few days. I'll be using it for architecture - inside and out. I can recall reading that someone used one with a center filter -- Drew Wiley? Anyway, I'll be using it with 4x5 with reasonable movements. From experience, does anyone think that the Nikkor-SW 90/4.5 requires a center filter with 4x5? Could I expect the drop off to be gradual or dramatic?