I could debate all day and still not be settled: my personal favorite wide angle Nikkor (manual focus, of course) is a tossup between the 24mm F2 AIS and the 35mm F1.4 AIS. For really wide, I like the older 20mm F3.5 AIS (52mm filter diameter) - sharp and compact. Although I also own the 18mm F3.5, I find myself carrying the 20 because it (with the HK-6) take up so little room in the old Domke...