Earlier this year I scanned a couple of hundred of my family's holiday snaps from the '60s and early '70s, most of which were taken using an Instamatic, and most of them apparently on Kodachrome (Kodachrome-X ?).

What I found photographically interesting was that the large majority were perfectly well exposed, despite all the strictures common amongst "serious" photographers about how slide film must be exposed with deadly accuracy!

Or were those old emulsions simply more forgiving?