I want to buy Nikkor SW 90mm/f8 for 6x17 camera. I have no drakroom and mainly f or color work. I don't know how much right full off will be(1 stop or 2,3?)on 6X17 format. Anyo ne can tell me that Center filter is needed or not, and how much for that CF, if it is must? Thank you.
C. L. Yuan