David Dyer-Bennet wrote,on my timestamp of 17/03/2012 1:42 AM:


(And now I'm not sure about the F, either; I only owned one of those
briefly, and only when it was quite old technology. Horizontal, I'm
sure, but material I'm not.

Okay, if I'm reading this right, this says Nikon switched the F to
titanium curtains early in its life.http://imaging.nikon.com/history/legendary/rhnc12ti-e/index.htm

Looking at my F's shutter, it looks like a thin metal of some sort, so I guess
titaniun is a good punt.