Depending on the lens -- Apo-Nikkors range in focal length from 150 mm to 1800 mm, in size from small to enormous -- hanging the lens in front of a shutter or hanging a large shutter (Compound #5, Ilex #5) may be possible. I use a couple of Apo Nikkors and other barrel lenses in front of a #1, have a Compound #5 with adapter to hold it in front of a 900 Apo-Saphir. Where there's a will and a budget there's a way.